There are several embeddable flash based MP3 players out there. Just Google "embeddable Flash MP3 Player" and have a look around.
Our powerpress plugin for wordpress will work for one podcast episode and may work for you by using the Powerpress shortcode. But that isn't powerpress' main job. Powerpress is for getting your episodes into your RSS feed in a way that works with the most end user's players. (along with a bunch of other stuff). Check out
http://help.blubrry.com/blubrry-powerpress/ and see if it will work for you. It might not be a correct fit for what you want to do.
-Mike