EasyTAG is an utility for viewing and editing tags for MP3, MP2, FLAC, Ogg
Vorbis, MusePack and Monkey's Audio files. 

The big new feature of this development version is GTK2 support.

Features:

- Auto tagging: parse filename and directory to complete automatically the
  fields (using masks),
- Ability to rename files from the tag (using masks) or by loading a text
  file,
- Process selected files of the selected directory, 
- Ability to browse subdirectories, 
- Recursion for tagging, removing, renaming, saving..., 
- Can set a field (artist, title,...) to all other files, 
- Read file header informations (bitrate, time, ...) and display them, 
- Auto completion of the date if a partial is entered, 
- Undo and redo last changes, 
- Ability to process fields of tag and file name (convert letters into
  uppercase, downcase, ...),
- CDDB support (from http protocol), 
- A playlist generator window, 
- French, German, Russian, Dutch, Hungarian, Swedish, Italian, Japanese,
  Ukrainian, Czech, Spanish, Polish and Romanian translations

WWW: http://easytag.sourceforge.net