Awesome. There are loads of dfferent scripts on this and some of them aren't so good, and it changes between them awkwardly, but I just find one i like and leave it alone until i get bored.
I've downloaded lots of visualizers and this is the only one i've kept.
I am a Free member 
(2) 
eXo music visualizer
paul wild reviewed on 18 Jan 2006
I've downloaded lots of visualizers and this is the only one i've kept.
iTunesCheck
paul wild reviewed on 16 Sep 2005
Developer; could you give us more options like shuffle and playlist hotkeys?