I'm betting that cyclists are going to be pretty excited by Liu Yu's Acousto Optical Lock. The Acousto Optical Lock is a bike lock that works like a car alarm to help you find your bike amid a sea of similar cycles.
The Acousto Optical Lock features an alarm system that is activated by the lock's key. When activated, the lock flashes lights and makes sounds to alert you of the location of your bike. In addition to its alarm, the Yu's lock is made out of some tough stuff, which should deter bike thieves.
I could see the Acousto Optical Lock being a huge hit in Europe and Asia, where bicycle riding is the primary mode of transportation in big cities and small towns.