From John George:
Mp3 Tag Tools is an intutive ID3v1.1 and ID3v2.x MP3 tag-editing utility. The application has several features, such as mass tagging, the ability to write tags from filenames and rename files from tags using custom formats, the ability to clean filenames and correct their case, get tag information using directory formats, and create directories and organize MP3s from tag info. It also features lyrics and picture tagging, the ability to accurately read all MPEG information, and append bit rate and mode to filenames. All of these tag operations can be carried out with or without directory recursion.