Audio Player
Once installed, this plugin allows you to insert mp3 audio files into your posts and pages.
Taraganas Del.icio.us mp3 Player
This plugin makes any mp3 links (in post or page or any other location in your blog) playable directly on your webpage. In addition, your visitors will have the opportunity to easily tag and post the mp3 link to del.icio.us.
A podcasters dream plugin with long list of features.