"Using high end Macromedia Flash (swf), MySQL, XML and PHP, FLAM Player is an online mp3 player with full featured administration backend for webmasters and easy use for final user. Make different playlists, arrange by author, name, random, read ID3 tags, edit songs infos, NO manual xml files edition, and more..."

This is a great little script incorporating a flash mp3 player. There a feature enabling you to specify a navigatible playlist and there are ASP and PHP versions available. You can quickly view three different demos of WS-MP3 the website and there's also a support forum available.

Additionally there is an "ultralight" alternative available in WS-Ultralight, also free but only available in ASP 3.0.

"XSPF Web Music Player is a flash-based web application that uses xspf playlist format to play mp3 songs. XSPF is the XML Shareable Playlist Format. The software is written in Actionscript 2." There are two versions available, 'Slim' and 'Extended'. It's very good looking and supports images if in 'Extended' mode. There is also a XSPF Web Music Player Wordpress plugin available.

GMTT Radio You Control is a PHP script producing a menu for users to use to select from a list of (externally hosted if you want) mp3s and create a playlist. "When they have chosen the music they want to listen to, click submit, and a streaming audio playlist is created. You have the choice to play this externally in windows media player, or embeded in the page. ID tags of mp3's are also displayed."