From LairWare Software:
Imagine a program which automatically fills in missing information in your music library. MPFreaker searches the internet to find out what album that song belongs to, the year that song was released, what genre that album belongs to, track numbers, even album cover artwork and lyrics -- and automatically adds this information directly into your song files, in seconds.
By using industry standard methods, you can see and access the new information MPFreaker adds in any audio player which recognizes these standard information "tags", including iTunes and the iPod. Artwork added by MPFreaker shows on an iPod's "Now Playing" screen!