Was listening to MacBreak Weekly #113 and just learned about this site. So far it’s only OS X.
If your like me, you hate DRM. So when I find music I like on iTunes, I usually only buy if it’s a iTunes Plus track (DRM Free). If not I head over to Amazon.com and get my DRM free music there. This script will do it for you. Once you find your music on iTunes, you launch this script and it will take you to the artist page on Amazon.com!