Board Pusher
Browse, rate and upload skateboarding, snowboarding photos, sequences and animations.
http://www.boardpusher.com/

Rideitall
Features photos of snowboarding, skateboarding, mountainbiking and snowmobiling.
http://rideitall.150m.com/

Skunkboy.net
Photos of all levels of skiers, snowbladers, snowboarders, aggressive inline skaters and skateboarders from Southwest Michigan.
http://www.skunkboy.net/

Xtremia
Offers motocross, supercross, BMX and snowboarding pics.
http://www.geocities.com/dazesty1/madcentral.html