A hoxfix for the windows WMF vulnerability hack can be found here:
Hexblog - Download WMF vulnerability hotfix
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. This script is extremely lightweight, as is the flash movie that plays on demand. Must-have for podcasters or anyone who wants to allow blog visitors to play mp3 files on the website itself.
If more than one file is clicked (for playing) on a single page, then the first one stops and the second file starts playing.
Sample mp3 file: the_thrill.mp3
More at : Taragana’s Del.icio.us mp3 Player WordPress Plugin -Simple Thoughts - Java and Web Technology Blog.