iTunes Artwork as a screen saver selection on your Mac is nothing new, unless you have OS X Lion. Now, if you have the new cat installed, you can play your music right from the screensaver. And this, ladies and gents, is pretty awesome.
It's so easy to do, too. Just go to System Preferences > Desktop & Screen Saver > Screen Saver and select "iTunes Artwork" from the list on the left.