I thought I'd post a link to a cool video I stumbled across. It's a 5 minute clip of gp motorcycle racing, mainly featuring Valentino Rossi. He's number 46 on the Blue/Yellow Yamaha and on the Orange Repsol Honda. The guy is a phenomenon. There are also a couple of crashes - so something for everyone.
Until I watched this video I wasn't aware that GP bikes were powerful enough to smoke the rear tire under acceleration. It's pretty impressive to watch them slide the bikes sideways out of the corners as though they were on a dirt track. The difference being that they can't stabilize by putting a foot down like the dirt-trackers do... If I were spinning the rear tire, I'd certainly lose the back end of my bike. Anyway, here's the link to the video.
Another link to another site. Loads a little quicker...