I traded my horse in on a mountain bike my sophomore year in college. Mountain biked for 3 years (and even co-taught the college course) then moved to California and added a commuter road bike to the stable. I just added a dedicated "race" road bike (though I don't race, just club ride) after 2 years of commuting. Next up...either a tri bike or a cyclocross or maybe a custom steel thing (probably mountain, but maybe road, who knows). Yes, I have a bike problem.

I love mountain biking, but road biking with the club and friends is growing on me as well. I commute to keep my mileage up and do my little part of reducing the carbon footprint, but some days it just sucks!