Forgot to mention this in my last post.

Ever since Jay-Z and Linkin Park have been collaborating for mash ups, mash up songs have been a hot commodity and Party Ben has done some amazing things.

http://www.partyben.com/

His "Boulevard of Broken Songs" mash up of Green Day, Travis, Oasis, and Aerosmith is completely amazing. His mash ups of Daft Punk/Queen, Incubus/No Doubt, U2/Way Out West, and The Hives/The Prodigy are also worth of mention.