Hi,
I am just cleaning my 20 GB music library and it is quite challenging even with Mp3tag as sometimes I do not have all the information. I have found that WinAmp uses "Auto-Tag" feature that behind scene is using MusicId technology from Gracenote to provide song title, album and artist based on "Audio Waveform Recognition" !!! In other word it is listening some part of a song and based on song characteristics then searches Grecenote database for song details. More info at http://www.gracenote.com/business_solutions/music_id/
It would be great it next version of the Mp3tag tool could use also this technology.
Best regards
Marek