Check out Adam Fulara, a polish master of the guitar tapping technique.
Check out the videos at http://www.adam.fulara.com/e.php?g=music
He is more than incredible.
edit: check out bwv 848, I think this is the most impressive. I like his
expression, too.
That was amazing! I can barely play using just one hand, but is using both his hands, with each one playing something independent of the other!