Today rolling across the social media landscape was 'Atropelamento na California' a video in where two guys, one wearing a POV camera filming the other in the Berkley Hills. Then they got hit, and the car ran. The footage is pretty hard to make out on YouTube but I think the raw footage was handed around and analyzed. They are currently narrowing it down. I think everyone should start wearing these and reporting, at $300 they are a cheep investment for proof of what went down. I have recently started riding with one and and I feel the way to go is 0.5sec time-lapse, because its easier to make out plates. Also battery life can be extended, but I really would like to see manufactures make a unit for cyclists for this purpose that is an easier system.
My current configuration is a GoPro Hero2 with a Battery BacPac mounted on a K Edge Big Pro Handlebar Mount I want to add an additional Hero 2 mounted on the Go Big Pro Saddle Mount as well.
Here are some resources: