Using them as one monitor gets a bit quirky since they run off two different graphics cards but it's doable.
The monitor directly in front of me is for whatever application I'm working with. *The monitory to the left holds my secondary windows (AIM, application folder, ftp folder, email, etc.). *I can keep an eye on everything at the same time.
What's really awesome is being able to drag and drop from one screen to the other. *
I like your random color script. *However, there are some ghastly pinks in there....make my eyes do this...