UPDATED: Tracks Without Artwork To Playlist v2.0
My friends at The Unofficial Apple Weblog posted a hint about Album Artwork that quickly caused a gushing of downloads for Tracks Without Artwork To Playlist. Unfortunately, the earlier version of that script did not account for artwork downloads from the iTunes Store, and thus would generate many false positives. I have corrected this in the latest version. Let me know how this new one runs at your place.