If you like to listen to music try
www.ccmixter.org
its a website that is made for Dj's, rappers, composers, and music fans.
Basically a Dj can remix accapellas sent in by rappers or sample some music made by another dj. Some of the remixes are pretty tight. Its pretty much all underground stuff though.. no names you would recognize... But if you flow and can submit your accapella those DJs and Producers will create some nice tracks for you.
this is our page...
http://ccmixter.org/media/people/4nsic