I just bought one of those cameras that ravens linked to. Can't go wrong for a little more than $1. (well, after shipping it came to something like $7)
I've never used the that camera in particular, but I have used a different one:
The one I used on this video isn't quite as good as the keychain kind, and it's shape was a little trickier to mount too. It was shaped like a usb thumb drive, and after it was strapped to my shock tower, stuck up above the wing. (bad for roll overs
) Plus, the sound/video sync is off by a half second or so.