Tony, maybe you should add Helium to this FAQ? With it you can edit tags, check integrity. You can inventory your complete MP3 directory and immediately see which files aren't completely right. To be absolutely sure you can select your whole collection and run the check tool. Cool fact is that they are working on version 2, which extends ID3v2 support!

Edwin de Vaan
mk2 rev.7 # 080000263 (queue 1232) 6+20Gb blue/red