There's only one format that I've ever driven. I have the circuit on "v8 supercars 2" on the playstation which is pretty handy!
Here's a couple of laps in a Porsche Cayman from video.google.com:
http://video.google.com/videoplay?docid=-6847738528593933417&q=sandownhttp://video.google.com/videoplay?docid=-4951271665790197982&q=sandownTrent Harrison has some great DVDs of historic sandown last year that would be a great help. If you're anywhere near Bayswater in the next week you might like to purchase a copy.
Scott: you need to crunch your video down to a reasonable size - not sure what tools you've got - I used 'kino' under linux to do the job last time. Then sign up for
http://video.google.com and upload your videos. Then you can link to them from here - Jim Nielsen's videos look great, I'm sure you can put him to shame?