I started commuting, using the bus part of the way in to work, and riding the 12.5 home in the afternoon. So far, so good. I have figured out the best route to avoid being smooshed or otherwise mangled by the cars. Crappiest piece of nastiness to date: the jerk who drove by and blasted me in the ear with an air-horn. I swear, some people... .
Oh, I've lost 15 pounds too.. I do like bicycle commuting.