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http://www.jiffypark.com/vids2/motorcycle/racing.htm
The site isn't the fastest one in the world, but the McCoy slide was pretty amazing. The Belgian Road Racing vid was all amature vid but it had it's moments, moreso towards the end... not too sure about the hay bales protecting the spectators though also had some on-board trackday vids in the mix, too.
Highlight of the page has to be the "Great Racing" vid at the top some older MotoGP footage from '03 or '04 it looks like.
EDIT: holy crap, look at the Track racing (2.88 MB .mpeg) vid, too