AppleScript is beyond useful for just iTunes - back in the 10.4/10.5 days, I used to use AppleScript for some pretty interesting things, including modifying the 'Extras.rsrc' file to perform some interesting functions like colouring windows and changing font files that OS X simply didn't support at the time.
I also recall making an AppleScript that did some other OS/GUI-level modification, such as choosing to have my icons at the left side rather than the right on the desktop (coming from Windows this was rather annoying)...it's an incredibly powerful and useful tool when utilized correctly and I sincerely hope Apple keeps it around.
EDIT: Damn, I looked around to find that old 'Cloak' program but it looks like macthemes.net has been gone for a long time...makes sense since there's no real 'scene' for that anymore as it's all dynamically-generated now :/