i heard nas just did a track with korn so i'm gonna wait to see what that sounds like. but as far as right i would have to say limpbizkit ft. DMX, Redman, Method Man - rollin remix that joint is still hot.
I can't think of any right know, but maybe that Run Dmc joint back in the day walk this way. I would like to see somebody do a song with linkin park though that would be tight!