Mp3tag is a powerful and yet easy-to-use tool to edit metadata of common audio formats where it supports ID3v1, ID3v2.3, ID3v2.4, iTunes MP4, WMA, Vorbis Comments and APE Tags.
[2009-08-14] NEW: added MusicBrainz Web Source.
[2009-08-14] NEW: added Cover-only Amazon Web Sources.
[2009-08-14] NEW: added F2 keyboard shortcut for editing in Tag Sources dialog.
[2009-08-14] FIX: fixed UI glitches when editing long titles at Tag Sources dialog.
[2009-08-14] NEW: Windows 7 now officially supported.
Product page: here