i am in to 3d Modeling, video editing, and web design. Having a program maximzed in one monitor and all the little windows open in another is a great help. Here's a screen shot of what i'm talking about:
http://www.nathanledet.com/Dual1.jpg
I made sure i had a lot of activity going on when i took the screen shot...it looks confusing, but believe it or not, i know what's going on!