I know this is probably old news to many of you, but I stumbled upon a neat program last night. It's called Guitar Pro and I found it while looking for some Pink Floyd tabs. Here's the link:

http://www.guitar-pro.com/en/index.php

It's a $60 program that has a 15 day free trial period. It's very useful because many parts can be entered. It's a sequencer of sorts. Very useful for getting a "score" feel of a song. It's definitely worth checking out.