MP3

mp3.com

Learn everything you need to play MP3 music on your computer! From the newest beginner to the advanced listener find all the answers to your questions here. Want 100's of music selections? You will find it here along with list of software.
http://www.mp3.com/

Beatnik

You've heard all the remixes of your favorite song -- the dance mix, the drum 'n' bass mix, the deep house mix. There's only one remix missing -- the one that you create. That's what Beatnik's interactive MP3 is all about.
http://www.beatnik.com/

MP3now

Find top 20 MP3 Search Engines, Players, Decoders, Encoders, Rippers, Newsgroups, Software, Hardware, and more.
http://www.mp3now.com/

MP3 Park

This  site is updated daily, providing you with MP3 related material as free MP3 music, software, skins, links and news.
http://www.mp3park.com/