unicyclist.com: Has Forums, Galleries and offers free webspace to unicyclists.

unicycling.org: Contains the "Roster of Unicylists", event listings and other useful resources.

unicycling.com: John Foss's Unicycle Page. Tons of good info as well the home for the Annual California Mountain Unicycle Weekend.

Unicycling Society of America: Unicycling Society of America's Website.

unicycle.com: Online sales of unicycles and parts.

Riding or hiking the trails? Then you should be helping out these folks!

Other Important Stuff

Want to be able to keep riding trails? Check out IMBA.