I was digging around in the developer tools folders, and found a perl script that removes the developer tools from your system. It is located in /Developer/Tools, and the name of the script is uninstall-devtools.pl.
You can run it from the terminal by typing:
% sudo /Developer/Tools/uninstall-devtools.pl[Editor's note: I have not tested this one; I need my Dev Tools!]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20021023062113136