I just checked out the new AmazonMP3 site to see what all the hype is about. Since I already have an existing Amazon account, it started to recommend music to me. Turns out that most of the recommendations were albums that I already have, ripped long before the days of including album art.
Since iTunes' "Download album art" feature is terribly hit or miss, I've tried to complete my library manually. I was delighted to discover that AmazonMP3 is easier to search than the corresponding Amazon CD stores, and the artwork on the site is higher quality than the CD store! Combined with the recommendation aspect, I'm able to quickly retrieve and add art for lots of artists in my Library. Thanks Amazon!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20070926072438550