Hauser And Girlfriend Benedetta Caretta Perform Awesome Cover Songs - The Music Man
In addition, for those who like the Disturbed cover of Sounds of Silence, they did it live on Conan and a Google search will find it. Even better than the official version posted above.
Also, for the wildest covers out there, anything by 2cellos. Lots of stuff to find on the net.
Cheers, Crazy Bill