It has different names but most people call it the DVR-007 cam. Unfortunately there are loads of fakes for sale with really poor image quality so I bought mine from dealextreme which sell the genuine version. I think it came to about £74 inc shipping to the UK from Hong Kong.
It's pretty good quality video and does it's job well. Here's a sample video of what it's like in town:
There's another camera which I want called the GS600 which is smaller but films in 1080p and can also record speed, etc.