On Sat, Aug 7, 2010 at 12:27 PM, Jonathan E. Brickman <jeb@joshuacorps.org> wrote:
 Is there a good GUI MP3 tag editor for Linux?

Depending on your needs you may wish to consider Picard. It's a python based tag editor brought out by the music brainz crew, so its good for auto tagging bulk files of known artists.

Available here: http://musicbrainz.org/doc/MusicBrainz_Picard

-mjn