I made a post about this earlier this morning in the Music section: http://gearlive.com/forums/viewtopic.php?t=737
There is a program that will search amazon.com for whatever album you currently have highlighted in iTunes, and then you can set that to your album art. Or if you’re feeling adventurous, you can run it all night and have it auto-pick art (it might be wrong) for ALL of your music. Works for most albums, others I have to go google-diving for the rest.