Wow, we didn't know that so many people would dislike the new iTunes icon. The staffers here at iSmashPhone each have their own opinions of the icon, but that doesn't mean that some of us don't welcome the change. It looks a lot better than that outdated CD.
Still, for those who don't like the new look, there is an easy way to replace it.
The 2.3MB file is available here: http://www.ryanrjames.com/itunes/ and includes all necessary files to be compatible with the Finder.