Outdoor Links
Google Earth: This is some of the coolest stuff on internet!
Topozone:  The web's topographic map.

The Mud Blog: Photos, News, Guide Book Updates, Trail Reviews, GPX files, and updated info on mountain biking and outdoor life in the West!

Mountain Biking Links
IMBA:   International Mountain Bicycling Association.
CORVA:  California group that preserves public access on public trails.
USA Cycling (MTB):   NORBA and lots more.

Mammoth Lakes, CA
Mammoth Mountain: The epicenter of fun with webcams!
Mammoth Ski Patrol: Avalanche, weather, and conditions on the mountain.
Sierra Backcountry: The locals backcountry adventure site.
Mammoth Weather: Local weather resources.

Kern River Valley & Kernville, CA: The Ultimate Adventure Town!
Mountain & River Adventures  &  Sierra South Outfitters 
Kern Valley River Council:  All about Kern whitewater! 
Kern River Flows:  Updated river flows at Kernville.
Stewards of the Sequoia:  Preserving hundreds of miles of singletrack!
Rock Climbing Kernville Dome: One of many rock climbing areas on the river.
Alta Sierra Ski Resort

Santa Cruz, CA
Surfline: Steamer Lane:  Surf report and live camera.
Santa Cruz GIS Interactive Map:  Very cool! 
MBOSC:  Mountain Bikers of Santa Cruz
Trailworkers:  Local trail-maintanence group.

Other Cool Outdoor Links!
Sierra Sojourner: Exploring the Sierras by foot, bike, boat...
SpaceWatch 
I Kitesurf.com
Rock Climbing.com
Boof.com:  Sierra Whitewater Kayaking
California River Flows and Weather