While watching episodes of The Boondocks (thanks to Sheletha) I was inspired to do a search on Mos Def after his remarkably believable performance as Gangstalicious (Gay Hip Hop Artist) and I ran across this entertaining interview featuring Cornel West, Mos Def and Bill Maher. The clip is strewn together and during the course of the show Mos Def was hilariously dropping knowledge. He was in left field a couple times, but he was mainly on point and Cornel West was his normal genius self. The show aired some time ago, but many of the points are valid even today.
** Some language not intended for young audiences, but if you aren't careful, you might learn something. **
[click "play" (the arrow button) to watch]