TuneSleeve is a free utility that downloads album art from Amazon for each album in your iTunes library (or in a specific playlist).
It allows you to choose which image is the best among all the images returned by Amazon, and if there is no good match you can launch a search on Google Images with the click of a button then drag&drop the desired image from Google to the album in TuneSleeve.
Download: TuneSleeve | 350 Kb (Free, but donations appreciated)
Screenshot: >> Click here <<
View: Features