podcasts have very little requirements, since they are based on RSS. One can certainly place a generated rss file from some podcasting framework into a filestore of a community to make it there available. To make the publishing side more comfortable, it would be a nice project to place the videos (with a few more meta-data than usually available) into the content repository and generate the podcast feeds on the fly (sounds like a nice exercise for xowiki).
We are doing currently some work on the production side, which is much more involved, since one has to address audio/video incodings and as well streaming formats, etc. We are going into protoype state this semester and would wish to have something in production quality for our efforts in autumn.