You’ve got to love the German Call a Bike service. Find a bicycle, make a mobile call to unlock, use for as long as needed (at � 0.06 per minute or �15 per day) and return at will with another call. Uber cool. [via Engadget]

‘Each CallBike is protected by an electronic lock that can be opened with a numerical code. If the green light on the lock blinks, the bike is free and it is yours to use. To obtain the valid code for your CallBike, simply dial the telephone number in the red circle on the cover of the lock. Then, all you have to do is enter the code in the lock display.’