wordpresspodcast

With the free wordpress.com blog account, there aren’t any fancy plug-ins to help with podcasting.

taken from http://support.wordpress.com/audio/ :

Adding Audio Files to Your Blog

Upload an mp3 file somewhere on the internet and link to it like this [audio ] with the address inside like this:

[audio http://wpcom.files.wordpress.com/2007/01/mattmullenweg-interview.mp3]