Hi,
While a small camera is great, I always carry one in the seat pocket. Give some thought to getting a small soild state video camera with an external mic socket.
You can then grab the sound as well.
I've just started doing this and my first clip is....
http://www.legrope.com.au/PAS/
You need to click on new video... be aware that it's about 10 meg.
My plan is to get a few clips to use as training aids for my tailwheel flying and aeros.
Just a thought....
Cheers
Wombat