My Art Club kids got together and made a podcast! Not all of them were into it for the first episode, but my 3rd, 4th, 5th, and 6th grade students wrote their own scripts and recorded them using an old iMac (so old it can’t run OS X) and Audacity.
The blog service is Class Blogmeister, a wonderful free service provided by David Warlick. To my knowledge Class Blogmeister doesn’t host files, but that’s what Ourmedia.org and Archive.org are for.