At this year's Goodwood Festival of Speed I took my photography a bit more seriously, lugging around not one but two SLRs (Canon 5D Mark II and Canon 40D).
The main reason for two cameras was to use the higher burst rate of the 40D to get action shots of the cars going up the hill or round the rally stage, while using the 5D for wider shots and cars in the paddocks, but I also used the 5D to get some video when I stopped long enough to set up the tripod.
Check out the video below. It's best viewed full screen and loud. You can also download the full 2.3GB 1080p version from the video page on Vimeo.