The guy who lives in the basement of my rowhouse uses Capital Bikeshare everyday to commute from DuPont to Georgetown. At $75/year and with a commute less than half an hour, he saves several hundred dollars/year on transportation and doesn't have to worry about storing and maintaing a bike. It's great (for him, I haven't ever used it). I'm working on a graduate degree in transportation policy and one of the alums of my program designed the Captial Bikeshare program... interesting stuff.