There is a new Playstation Portable mod floating around the internet that allows you to use your PSP screen as a second computer screen. It hooks into your computer and can allow you to drag windows into there. It works well if you use AIM a lot because you can put the windows in there so you don’t have to minimize them.
This is one of my favorite reasons for getting a PSP over a Nintendo DS. The PSP has so many great mods out there that allow your PSP to do just about anything. With all mods, you do need some new software with it. You can get the needed software here.
If you are interested in watching it done, here’s a youtube video on how to do it.