GolfCollector.com: Message board to discuss collecting golf scorecards.
TennisCans.com: Vintage tennis ball can and container database. Includes message board, photos, manufacturers, guide to cleaning cans, age, history, and type.
The Olympic Collectors Commission: Features stamps, coins and memorabilia items in a virtual gallery, including items from 1896 Athens and forward to Sydney 2000. Also offers event list and related links.
Washington State Sports Collectors Association: Sponsors an annual show in Seattle. Includes club meeting times, show information and dates, dealer profiles, and membership information.