Looxcie has just updated its Bluetooth ear set that doubles as a camcorder and a storage device. The unit weighs in at just 22 grams and stores video as MP4 files. Of course, with a stealth cam, you could capture a lot of video without raising any unwarranted attention. Hopefully people do not use it for the wrong reasons, but I guess that risk runs with any new technology now a days.
Before you laugh at the idea of this tiny unit being a video camera, note that the two models available offer either 5 or 10 hours of video storage, respectively.