I joined what.cd recently and I came across these on the forums they have on there. Loads of production kits from people like Kanye West, J Dilla, and the Wu-Tang Clan.
Judging from one I downloaded, they seem to be full of pretty neat samples (drums, vocals, etc.). So give them a try, they might come in handy!
http://www.filesonic.com/folder/9047941