Here's a link to one of my autocross videos. Taken with a Nikon Coolpix S610 mounted to the rollcage. Not a glamorous setup, but considering I already had the digital point and shoot camera it gets the job done quite nicely.
(I still can't figure out how to embed Photobucket videos on forums like people do with Youtube, so please excuse the link.)
And link to a few more autocross videos in my "album."