For anyone who enjoyed The Grey Album or Jadiohead, peep this: Jay and Marvin, Jay-Z mixed with Marvin Gaye. Jay has a history of using old soul samples, so it only makes sense that a mash-up like this would work (not a very creative idea either). Go to The Animal Show to get a listen of some of the better tracks.
Also, if you like rap and The Black Keys, peep this: BLAKROC. Its a collaboration between Black Keys, Damon Dash, and featuring MC’s such as RZA, Mos Def, Q-Tip, Ludacris, Pharoahe Monch & Raekwon. Exciting.