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MP3 Boss
Full-featured file management system for MP3 collections. Includes integrated support for Winamp, automatic scanning of ID3 tags, extensive database functions, file cleanup, and general file management.
www.mp3-boss.com/

Advanced MP3 Catalog
Windows tool with an Explorer-like interface that allows users to catalog MP3 files by adding comments and sorting by quality or specific ID3 tags.
www.wizetech.com/

DailyMP3: MP3 Playlisters
140+ downloadable programs to manage and/or list MP3 files.
www.dailymp3.com/

MP3 Detective
Program that searches for MP3 files, manages playlists, and plays (through a default player.)
cheqsoft.com/

MP3 File Editor
Utility to help manage MP3 collections. Combines an MP3 player, tag editor, and file manager. Can rename files based on the ID3 tag, supports M3U playlists, and can export playlists in DBF, TXT, and HTML formats.
www.mp3fe.com/

Playlist Magazine
Online editorials and news for iPod enthusiasts.
www.playlistmag.com/

MPEG Script
Utility which reads data from MPEG audio files and creates text file reports displaying artist information, title, and other optional details. Can output to txt, rtf, and html formats with various sorting and grouping options.
www.dv.co.yu/

WinCue
Winamp playlist cue program designed for MiniDisc recording. Features a free download, documentation, and a FAQ.
www.wincue.org/

ID3-TagIT
Windows freeware ID3 tag editor with many advanced features. Supports ID3 versions 1.1, 2.3 and 2.4. [English and German]
www.id3-tagit.de/

Dj Quarc
Winamp plugin for managing MP3 files. Allows users to search through their collection and view the most recently played songs and playlists.
www.xi-quadrat.de/