The site mac-forums.com has a really nice writeup on launching GUI apps as root. After searching macosxhints.com fruitlessly I found this hint to be succinct and useful.
[robg adds: I haven't needed a GUI app running as root for quite a while, but that's probably because I tend to do most of my root editing in the Terminal using sudo vi. Keep in mind that you can do great damage quite easily if you're running an editing application as root; I strongly recommend quitting the editor as soon as you finish whatever task required root.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20040709221157255