Don't know if you would count this as rap, but I listen to Girl talk.
Here's a clip of his shit.
[video=youtube;YLznmzGrZ3A]http://www.youtube.com/watch?v=YLznmzGrZ3A[/video]
But yeah, he uses a lot of rap in his mash ups, and it is pretty much the only way I listen to rap.