If you check out my earlier ride videos(youtube.com/user/1nterceptor/videos); I just used mostly
compact point and shoot cameras. Olympus 810, Samsung HZ30W, etc. I used a mount that goes on the bars:

http://dx.com/p/fotopro-flip-motion-...r-orange-32974

For added stability, I wrap the camera with some strips of an old inner tube.
4:40 mark in this video:

http://www.youtube.com/watch?v=uEwthddqM9U