Federation for Sport at Altitude  
   Covers high-altitude sports such as skyrunning, skyski, skybike and sky raid. Site contains a calendar of upcoming events, related links, news items and membership details.
   http://www.fsa-sky.org/

Extreme Bros  
   Features BMX, climbing, skateboarding, snowboarding, surfing and wakeboarding. Includes news, events, forums, photos, videos, tricks and tips.
   http://www.extremebros.com/

EXPN.com  
   Online version of ESPN's action sports network covering skateboarding, snowboarding, surfing, inline skating, BMX, MotoX, and X Games. Includes photos, events, tricks and tips, athlete columns, biographies, videos, and contests.
   http://expn.go.com/

Street Active  
   Free 'Learn to Ride' clinics in skateboard, BMX, inline speed skating and inline hockey by accredited coaches.
   http://www.streetactive.org/

Ekstremsportveko  
   Norwegian extreme sports week involving base jumping, skydiving, paragliding, rafting, kayak, climbing, and mountainbike. Includes photos, results, videos, and sign up information.
   http://www.ekstremsportveko.com/

Kiiking  
   A new sport-art from Estonia. Features history, events, mission, photo gallery and services.
   http://www.kiiking.ee/

Point X Camp  
   An action sports camp for kids located in Southern California and specializing in skateboarding, BMX, inline and motocross. Includes camp summary, dates, location, contact information, fees, application, equipment requirements, and image gallery.
   http://www.pointx.com

Adventure Sports  
   Covers activities such as mountain biking, surfing, rock climbing, sailing, snowboarding, and surfing.
   http://www.suite101.com/welcome.cfm/adventure_sports/

Camp Woodward  
   Features tips and tricks for inline skating, skateboarding, and freestyle BMX racing.
   http://www.woodwardcamp.com/

Ripboard  
   Features photos, video clips, general information, and equipment of riverboarding whitewater at face level.
   http://www.ripboard.com/

Grindco  
   Specializes in all aspects of extreme sports entertainment; from conception, to marketing, to onsite production and operations. Specializes in skateboarding, snowboarding, ski jumping, BMX, motor scootercross, and personal watercraft racing.
   http://www.grindco.net

Air Above Water  
   About worldwide cliff jumping. Includes photos, jumpers profiles, and directions to each jump site.
   http://www.airabovewater.com