I'm waiting on a new, all-weather helmet cam to ship on the 20th. During my first year of commuting, I had my handheld mounted to my bars. Recorded a lot of interesting things, but since it's a SD cam that I can't reasonably mount to my helmet, most of the footage was just too shaky to be usable, in particular, the unreadable license plates.
I'm eager to get footage again...provided it's not my own untimely demise.