Climbing can be exciting as hell and hard as hell. It's not for everyone, especially the more challenging climbs.
Colorado Mountain School
Based at the foot of the Rocky Mountain National Park, this organization offers courses, climbs and expeditions all over the world.
This site has information on destinations all over the world for climbing expeditions along with other outdoor activities.
Alpine Ascents International
You’ll like this site if you’re a very serious climbing and you want to attempt some of the most challenging climbs in the world, including Everest.
This organization offers guided climbing and courses in Joshua Tree National Park in California.
Terrific site offering vacations to groups of people (usually 10 or more but not always). Prices are reasonable to receive the chance to venture into the Sequoia National Forest to rock climb, kayak, and ski.
Great site covering high-altitude climbing. Damn it's cold up there!