Ditto. Brief summary for anyone who is interested: most crossfit workouts are a mix of weights and body weight exercises, but done at an aerobic pace. A typical workout might be 15-30 minutes (+ stretching before and after), after which you feel completely spent. Crossfit scales well with different ability levels and there is a lot of variety in workouts, so you don't get bored. The WODs (Workout of the Day) are posted on crossfit.com daily, and you usually won't see the same workout for 2-4 months at a time. It's fun to do a workout, struggle, then do the workout again a few months later and find that you improved significantly and no longer struggle.
From the CrossFit Faq (http://www.crossfit.com/cf-info/faq.html):
"The world's most successful athletes and coaches rely on exercise science the way deer hunters rely on the accordion."
I hate to say this damages my perception of CrossFit.
This is because exercise science is doing experiments that were proven effective by practitioners years ago. In the same way you wouldn't expect to learn bleeding-edge hacking techniques taking classes at the undergraduate college level.. you'd expect to learn them from people who've used them effectively and are re-using them often.