Just bought a bike this last weekend, and I'm in love with it. It's a Fuji Cross Comp and it's built for trail riding as well as road. My cardio is now interesting and I can't wait to get back on the bike everytime I get off. I'm noticing killer separation in my quads from it too, already logged about 50 miles.
I actually think that after this competition, I'm going to start cyclocross racing. It looks like so much fun.
Check it out for yourselves... or the 2 people who are bored enough to read my log, haha.
YouTube - Cyclocross: An hour In hell