I have just added a very good media player to my mu, it uses the Kimili Flash Embed plugin, it gives music, video and radio, The media player is Dizzler, the embeded code they give you on the site doesn't work, so you have to put a direct URL for the source of the player in swf.
If you want to use it, use the following url as your source
http://www.dizzler.com/player/pod.swf?p=45d7401b2afbb
It works fine. see it in action at my site http://uk2uonline.info/ ,
I still cant get emails to users even after installing the smpt plugin.
so for now I am just trying out different things that will or will not work with mu.