Looks like we're finally getting some bike sharing locations through Capital Bikeshare, a regional program where you can rent bikes for a few hours and then drop them off somewhere else. Here's the map, which includes locations near 14th and Irving, 11th and Lamont, the Petworth Metro, and 14th just north of Spring Road.
It's a pretty neat program, and I can see myself using it. All the locations are on this map:
View Capital Bikeshare in a larger map