A guy I know has nifty little mount for his digicam that he puts on his headtube. Might be a RAM mount, I could ask him about it. take pretty good video, and is quite accesible.
Anyway since this happened
http://www.westsidebikeside.com/paul...o-front-light/
He's been riding around with it on all the time. With how big and cheap memory cards are these days you could just leave it running while riding, and delete the video at the end of your ride if nothing eventful happened.