UPDate:  If you’re running Vista, it might be a good idea to wait on this software. It made my already problematic display a bit worse.

Here is a free script for organizing your computer’s desktop that seems well-liked in the Private Section of  Warriorforums.com. My desktop needs organizing, badly. This looks like it might be just what the md ordered. I’ll have to write more as soon as I get it up and running. 
It’s called Stardock Fences and you can get it here at Free Desktop Organizer

Works on Windows XP, Windows Vista, or Windows 7.  On Vista and Windows 7, both 32bit  and 64bit versions are supported.