The greats folks at Unsanity have just released a new APE module that allows you "a haxie that completely customizes Mac OS X interface with custom themes and more". Apparently was not only designed by Unsanity but all the top dogs in the Mac theme(ing) community (Max, BBX, etc). But this theme(ing) solution is thought to be the safest yet, since it doesn't modify any system files, and the best since it allows the users to conifigure the entire look of MacOS X without affecting the choice of other users on the computer. It sure is worth checking out, even if you are or aren't much of a themer.