Candysoft has released TunesDoctor (http://www.candysoft.com/tunesdoctor/), an US$19.95 program for fixing disorganized music collections.
It can automatically fill in missing ID3 tags, fix incorrect ones, find cover art and add lyrics. TunesDoctor is compatible with iTunes, Windows Media Player, Foobar and Winamp.
The software can also find high resolution album artwork images. Missing lyrics are also added.