(Image credit: Skylock)

Want to let a pal borrow your bike? Skylock is a peer-to-peer bike sharing system, like Airbnb for two wheels. In addition to allowing multiple users as administrators, the lock can alert the owner to attempted theft, identify itself by GPS on a map, notify friends in the event of a crash, and unlock itself based on the proximity of the owner.

Create Your Own "Bike Airbnb" With This New Networked Lock | Co.Exist