S - Alphabetically
SAGA - Graphic design, illustration and web, based out of Brodhead.
Saichek/Vail Hypnotherapy - Wauwatosa group that provides therapy, videos and Ericksonian hypnosis.
St. Martin's Lutheran Church - Cross Plains.
St. Mary of Pine Bluff Catholic Church - Cross Plains, Wisconsin.
St. Matthew's Lutheran Church & School -
St. Patrick's Catholic Church - Madison.
Sample Cartographics - Custom map design, production and publishing. Also provides geographic analysis services. Sells an atlas of Dane County.
Sandpiper - On-site soil investigation, morphological evaluation, and percolation tests.
The Sapphire Ballroom - Ballroom dance and reception center, also sells dance apparel.
Sarho's Company - Change Your Life Books - Self help and how to books and CDs.
Savante - Internet consulting and web design and hosting.
Sax Custom Designs/Nature's Essence - Jewelry, bird carvings and gift products in the Dells area.
Schaefer's Stained Glass 'n' Crafts - Mosinee-based business offers supplies and classes for crafts like stained glass, beadwork, mosiacs and glass etching.
Scheffer & Wexler, SC - A full-service law firm emphasizing conscientious advocacy and total client satisfaction.
Science Savvy - Web site dedicated to explaining the how do you knows of science.
Schlosser, Art Paul - 
- Madison's most famous street musician.
Scholar Power - Sells educational software.
Scholastic Chess Club of Madison -
Schwenke and Associates - Industrial chemistry consultants.
The Scout Report - The Scout Report is a weekly publication offering a selection of new and newly discovered Internet resources of interest to researchers and educators.
The Scout Report for Business and Economics - The target audience of the new Scout Report for Business & Economics is faculty, students, staff, and librarians in business and economics.
The Scout Report for Science and Engineering - The target audience of the new Scout Report for Science & Engineering is faculty, students, staff, and librarians in the life sciences, physical sciences, and engineering.
The Scout Report for Social Sciences - The target audience of the new Scout Report for Social Sciences is faculty, students, staff, and librarians in the social sciences.
The Scout Toolkit - Summaries and analysis about current and future network tools, as presented by the Internet Scout Project.
Second Chance Animal Rescue and Education Network - Provides medical care for stray or unwanted animals and tries to find homes for them. Almost exclusively deals with cats.
Senior Connect Database - List of Dane County programs of interest to older adults. A project of the East Madison/Monona Coalition of Aging, Inc. and the Dane County Department of Human Services.
Seventh Dimension - Collectable card games, Star Wars collectables, vinyl records and CDs.
Seventh Generation Information Services - Middleton company develops solutions for LAN/WAN, web-based and thin-client environments. Also sells Geographic Information System (GIS) technology.
SF3 - The (deep breath) Society for the Furtherance and Study of Fantasy and Science Fiction. It hosts WisCon, a yearly local Feminist Science Fiction convention, as well as monthly book discussions and probably other things as well.
SGS Web Services - Internet design and scripting.
Shadow Fax,Inc. - ...offering OEM and recycled toner cartridges, micr toner, Hewlet Packard, Lexmark, and Kyocera printers, sales and service, next day delivery, and new and used printers.
The Shaw Company, Inc. - A full-service commercial real estate firm based in Madison, Wisconsin, active in South-Central WI, providing commercial leasing, property management and property brokerage services. Primary property focus is office buildings and shopping centers.
Shepherd Express - Milwaukee's alternative newspaper.
Show-it Shelf - - Get it out and show-it off.
Siemens Energy & Automation, Inc. Analytical Instrumentation -
Sierra Club, Four Lakes Group - 
- Doing environmental and conservation work in the Madison and Dane County area, as well as, outings to hike, bike, camp, boat, ski and more!
Sirius Sunlight Glass Studio - - This Mineral Point-based business creates stained glass, hot glass sculpture, fused glass and more. The Christmas ornaments and Aquariphernalia (aquarium ornaments) look especially interesting.
SITEL Technology Services - Outsources help desk, customer service and telemarketing services. Site includes employment information.
Sites 4 Seniors - - Dedicated to helping Senior Citizens in the State of Wisconsin find useful information on things like activity centers near you.
Slack, Tim, Auction and Realty - Auctioneer, appraiser and real estate broker in Fennimore.
Slack Online - Political 'zine, used to be published on paper. Requires frames-capable browser.
The Slant - Madison Area Technical College student publication.
Sleepy Valley.Com - - Fiberglass, upholstery, photography, and web design. The site IS Mark Salamon.
Slideshots Multimedia - 35mm slides and colored overhead transparencies, Madison.
Slumberland Furniture - Furniture store with two Madison locations and some great sales.
Sly in the Morning - WIBA FM's morning radio shock jock now has his own site.
Small Business Development Center - Solutions for small businesses.
Small Bytes Inc. - Computers, networking, training and service, based out of Cambridge. Site requires a frames-capable browser.
Smart Studios - Madison recording studio.
Smart Toyota - New and pre-owned Toyota vehicles. Includes a form to search their car inventory.
Smelly Kat Productions - Web page production and maintenance.
Smith & Gesteland LLP - Certified Public Accountants and Business Consultants.
Smoky's Club - #1 steakhouse in the Midwest.
Soccer Scoop - Locally-produced online newspaper covers the world of soccer and related topics.
Social Justice Center - The Social Justice Center is a nonprofit office center cooperatively-owned by Madison Community Co-op, the Tenant Resource Center, Wisconsin Citizen Action Fund and Wisconsin Community Fund.
Society for Cryobiology - Promotes scientific research in low temperature biology.
Society for Technical Communication, Four Lakes Chapter -
Society of Women Engineers, UW-Madison -
Software Resource Publications - Technical writing.
Solheim Billing & Grimmer, SC - Organized around the premise that large firm sophistication and skills can be provided in a small firm atmosphere.
SoloTech Software - Creates tools for using the Internet, including the Internet Site Manager shareware program.
Sonic Foundry - Makers of Sound Forge music editing software for Windows, based in Madison.
Sortis LLC - A marketing consulting firm specializing in strategic branding, marketing and Internet projects. As a full service agency, Sortis plans and implements with a focus on return on investment and achieving your business goals.
Soundwaves Online - Vinyl recordings for sale, also has import CDs. Based in Spring Green.
Soundz - "The music nexus" provides information about music on the internet.
South Central Wisconsin Library System - Home of SCLS and LINK, the Library Interchange NetworK (you capitalize the k on the end of Network to spell LINK).
Southwestern Wisconsin Traders - Darlington independent distributors of Golden Pride International.
Space Metrics - Custom fabricator of frameless, European-styled cabinetry and laminated storage systems.
Space Place - A center for educating the public about astronomy and space science, operated by the UW.
SpearWeb - Information related to Spearhead, rules for division-level World War II wargaming.
Special Libraries Association Student Chapter - UW-Madison chapter of the SLA.
Spectrum Multimedia - Madison group that produces multimedia CD novels for PCs.
Spectrum Multimedia Inc - A division of the Royle Communications Group, Inc.
Spectrum Publishing - Web design based in Fort Atkinson.
SportSavers - A sporting goods/specialty inline skate shop in Madison.
Spring Green Cafe and General Store - Features an "eclectic mix of products and healthy food" from a converted cheese warehouse.
Spring Green Chamber of Commerce -
The Springs Golf Club Resort - Golfing near Spring Green.
Spruce Tree Music and Repair - Retail store specializes in stringed and fretted instruments like guitars, banjos, mandolins, violins and so forth.
Spyder Studios - Spyder Studios - S&S Productions.
The S.S.Studio - Now known as Ann-S-Thesia's.
Stafford Waller - Health and Welfare benefits consulting and insurance brokerage services. Now part of Virchow Krause Stafford Waller.
Standard Networks - Developer of secure data exchange software products and provider of web integration and network security services.
Stark Homes - Real estate.
Starr Writing & Desktop Publishing, LLC - Let us take care of you, so that you can take care of your business.
Start Renting Magazine - Published on the web and on paper. A searchable listing of apartments in Madison, Milwaukee and Green Bay.
State Bar and Grill - Nothing Else Like It. Site plays good music, too.
State Capitol Credit Union - Formerly known as the State Capitol Employees Credit Union.
State Collection Service - Accounts receivable management and debt recovery firm in Madison.
State Historical Society of Wisconsin - Bringing history to life.
State Medical Society of Wisconsin -
State Street - The State Street Business Association.
Steffen Log Homes - Delivering Wisconsin log homes to the quality minded family.
Sterling Concepts, Inc - Custom homes design and construction.
Stevens Point Area Convention & Visitors Bureau -
Steve's Curling Supplies - - Family-owned business sells brooms, stones, brushes, sliders and other items used in the sport of curling. Also has clothing and gifts.
Steve's Wine Market - - Retail wine and spirits store emphasizing value and service.Gourmet food items. Party planning. Gift Ideas.
The Story Guy - "Hardy The Story Guy" is actually a Madison storyteller for hire who entertains kids with folklore and puppets.
Stoughton Composites, L.L.C. - Based in Broadhead, builds refrigerated domestic containers and trailers.
Stoughton Trailers - Products, parts and repair.
Stracener, Ernest, - Web Site Design and Maintenance - The name pretty much says it all.
Strang, Inc. - An architectural, engineering and interior design firm in Madison.
Stransky Printing - A local printer.
Strategic Business Solutions - Professional speaking & consulting.
Student Impact / Campus Crusade for Christ - UW-Madison chapter.
Studio 109 Sculpture Gallery - Sculptures.
Styles on Video - Computer hairstyle imaging.
Success Computing Technologies -
Sugar River Raceway - - Welcome to Go-Karting.
Sunporch Cafe - Madison restaurant.
Sunrise School - - Child care and education based in the Monroe Street neighborhood.
SupraNet Communications - Internet Service Provider.
Surf Madison - Collection of services, including old BBS (Bulletin Board Service)-style web sites, clip-art and other games.
Surf Sauk Prairie - A Sauk City / Prairie du Sac guide.
Sustain Dane - A coalition of individuals and organizations promoting sustainability in the Madison and Dane County area of Wisconsin.
Suttle Press - One of southern Wisconsin's premier offset printers.
SWAGUR Enterprises - Designer and manufacturer of products that let satellite hobbyists and professionals receive local weather, warnings, radar summaries and satellite images.
Syndesis Corporation - Makers of InterChange 3D translation software, based in Jefferson, Wisconsin.
Systems Seminar Consultants - SAS service provider.