I'm sure some of you have heard of it. It's a great program and i recommend it to any guitar or bass player. if you want to download the program (it's FREE) click here

Thousands and thousands of real songs have been tabbed out on the program so that you can play them back and learn them. I love it because you can slow parts down and learn them at a slower pace and built up speed as you learn it. Here's an archive full of songs people have tabbed out: www.powertabs.net

Also, it's great for tabbing out your own ideas when you are trying to create songs that consist of more than one guitar and you dont have any other guitar players around. here's one i started working on just today:
http://www.zerstoren.com/files/MY%20SONG%202%20in-work.mid

it's a great program, you should check it out. btw, what do you think of the song? it's the first one i have actually really tried to make, but i've been using the program to listen to other songs for months.