Fun Places to Bike in WV - Great site with loads of information about trails in WV (including Blackwater Canyon).

Timberline Mountain Biking Center
Canaan Valley    1-800-SNOWING

Blackwater Bikes
Davis    304-259-5286

Highland Scene Tours
Davis    877-223-5388

Blackwater Falls State Park
Davis    800-callwva

Canaan Valley Resort State Park
Canaan Valley    800-622-4121

Timberline Four Seasons Resort
Canaan Valley    800-SNOWING

Allegheny Highlands Trail
Thomas to Elkins    

West Virginia Mountain Biking Association

daMaps (great source of maps with difficulty ratings)