In reply to Blizzard:
I've used one a few times, I enjoy messing around with video editing software and it offers up some interesting footage. Unedited I agree, it looks dreadful but used to:
a) Capture someone else climbing on the route next to you.
b) Face backwards and capture the view
headcams can produce some quite interesting stuff. Even faced slightly down in 940p (4:3 aspect ratio) you can capture hand and foot movements which, if edited in to other footage, can look pretty good.
That said I didn't get my GoPro for use as a headcam, I wanted a camera I wasn't scared to use out and about, something a little tougher. My Panasonic SD90 was getting chalky and banged up. I'm looking forward to getting some proper use out of it when it warms up a bit and I can get outside more (yes, I'm a wimp).
And nope, I'm not likely to make ANY money out of my footage, but that doesn't mean I don't enjoy editing clips together, similar to how 99% of people taking photographs have no interest in selling them.