EasyTAG

EasyTAG is a utility for viewing and editing tags for MP3, MP2, MP4/AAC, FLAC, Ogg Vorbis, MusePack, Monkey's Audio and WavPack files. Its simple and nice GTK+ interface makes tagging easier under GNU/Linux or Windows.

The program exists for the both versions of the GTK library 1.2 and 2.4. The GTK 1.2 version wouldn't change a lot (may be some bugs fixes), as all new developments will be concentrated on the new GTK 2.4 version.

More information & Download
http://easytag.sourceforge.net/

I used Tag&Rename in Windows for editing ID TAG, etc., but since I migrate to Ubuntu, this application really helps me a lot!