http://www.power-tab.net/

really good just go on 991 tabs and download power tabs once you have this then click open in the power tab editor and then open up the tab.
You can make your own as well but i'm not that good .

http://www.911tabs.com/
thats 911 tabs for you as well

Edited at 18:20 Sun 20/05/07 (BST)

Guitar Pro 5 is also a pretty good tool.
http://www.guitar-pro.com/en/index.php
Download the tabs from Ultimate Guitar etc. and your away.
http://www.ultimate-guitar.com/

i thougth you had to buy that lol