A few great documentaries to watch for you real fans.
Scratch - http://video.google.com/videoplay?do...4575841814301#
One of the quintessential docs about hip hop in my opinion. You see a lot of old school hip hop history with the likes of Bamabaataa and others.
Beat Diggin - http://www.youtube.com/watch?v=XPYEvx-pNMo
This'll flat out just make you appreciate vinyl records again. Now these cats LISTEN to music.
Good Copy, Bad Copy - http://video.google.com/videoplay?do...1317653995812#
It's more about piracy, but it has a large and really good segment with Danger Mouse (of Gnarls Barkley) who did a mash-up mixtape of Jay Z's Black Album and The Beatles White Album, and ultimately got in a lot of trouble even though he intentionally made no money from it. It kind of tackles the issue of sampling.