Agent MP3
http://www.agentmp32000.com/
Agent MP3 is a tool to search for mp3's on usenet

MediaGrab!
http://www.eastbaytech.com/mediagrab.htm
MediaGrab! is used for finding downloading media files from the web, Usenet and more. Instead of using a web page search engine to search to find multimedia files, you can use MediaGrab!

MP3 Grouppie
http://www.napasoftware.com/mp3g.html
Why spend time searching the web for MP3s when you could be downloading thousands of MP3s from your local news server?