TuneUp is a software that helps you clean your iTunes music. It adds the correct tags (ID3), correct your song names from song0001.mp3 to the real name, also finds the album art cover.
Unfortunately it is not free as we Linux users are used to, but it is a real good piece of software, and they have now an offer of 20% off the regular price, I’ve just got an email.
I wanted to share with you this info.
Enter this code PUNKROCK2010 when buying TuneUP Gold or Annual edition.
This code is good through May 4, 2010.
If you want a Linux free option, you may try, Picard music tagger