I was walking from my office to the Metro station the other day and noticed this new bike rack in Farragut Square. It's SmartBikeDC, a new program from DDOT and Clear Channel Outdoor (an advertising company).
Upside: The price is right -- $40 for the year with unlimited rentals.
Downside: Locations are clustered in downtown DC and you can only rent them for three hours at a stretch.
Arlington County Board member Jay Fisette is spearheading an effort to bring kiosks, possibly including bike rentals, to Arlington. For $40 a year, I'd definitely sign up! On the weekends, a bike would be way quicker to get from, say, Ballston to Courthouse than waiting up to 20 minutes each way for an Orange Line train.