This site was pretty entertaining! It's got animaton and a demonstration of the "Mr. Fastfingers" shredding at first, and then later during the lessons, if you press any key a-z an excersise in tab form shows up at the bottom and the animated guy plays the music! There's even a metronome to help you keep in time! Enjoy!
http://www.guitarshredshow.com/
http://www.guitarshredshow.com/