As a recent convert the Clutter (thanx robg!), I thought I'd add a little script to iTunes so I could start Clutter from there. So I opened Script Editor and just did:
tell application "Clutter" activate end tellQuit iTunes, save the script as a compiled script (use "Launch Clutter" or something similarly useful for the name), and put it into ~/Library -> iTunes -> Scripts. If you don't have a Scripts folder, just create one and then put the script into it. Start up iTunes, and the script should now appear under the scripts menu (the script icon between the Window and Help menus). I'm sure this could be developed further as i'm only a very basic AppleScripter.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030520070730100