I bought a cheap ($40) Emerson video camera. It's tiny and is in a waterproof housing. It's comes with a mount for a bicycle helmet or handlebar. I mounted it to the left handlebar and went up Lookout Mountain. Late in the day and got stuck behind some slow traffic. So I turned around and came down.
The mic is muffled by the clear waterproof housing, but going downhill there's not much throttle. I used the video editor in Windows Media to edit and add music. I also had to learn how to change CD music into MP3.
The sun was setting behind Lookout Mountain so the video is dark in many places compared to the bright sky. I could set it to HD, but instead set it to 640x480 because I didn't know how many minutes I could load onto the 8Gig memory card.
http://www.youtube.com/watch?v=MSPWsP0kgWs