i use a combination of "fetch art" and "album cover finder" between the two i have found about 90% of the artwork for my 5,000 song library. "fetch art is actually imbedded in itunes so you dont have to open up a program, you just click on the toolbar of itunes and run it when you come across a song without artwork. "a;bum cover finder is more comprehensive, actually showing the artwork, song list from each album of the artist, very nice.