This new version of the Musicbrainz Enabled tag Editor is now available for Macs, Windows and Linux.

New features include:
Updating tags from Discogs,
Update tags from Musicbrainz can now work just from release Ids
Many improvements to Manual Tag from Musicbrainz

Full details at http://www.jthink.net/jaikoz/jsp/news/build1050.jsp

thanks Paul