Kai's link seems too good to pass up without passing it on...

You also need to get up on Wild Style and Scratch.

I watched "Scratch" on the train from DC to NYC, on my way to my friend's wedding. The X-ecutioners, Scratch Picklz and all the originators put the art form in perspective for those who don't know, and accentuate it for those who do.

Head noddin' acceptable...