The Null Device
The latest city to get a bike-sharing programme is San Francisco. A scheme is being rolled out both within San Francisco and technological/research hubs like Mountain View and Palo Alto along the west side of the bay. The scheme will be fairly limited compared to London or Paris; the bikes in San Francisco will initially only be in the business centre around Market St., and won't cover areas like the Haight, Golden Gate Park or the Mission District, and there are no plans to extend the scheme to the east bay (Berkeley/Oakland and such).
I'm half surprised that Google, Facebook or some startup haven't rolled out their own bike-sharing system first, with intelligently mesh-networked, location-enhanced bikes which may or may not interact with the rider's advertising profile and/or online identity.