http://www.ultragraphik.com/blog/
This site gives you the samples that were used to make beats. It first gives you the original sample and then it shows how it was flipped. Pretty sick. Here is J Dilla's The Red.
Sample
http://momonox.free.fr/divers/criswilliamson.mp3
Flipped
http://momonox.free.fr/divers/jaylibred.mp3