For anyone who uses mp3tofid and rsync, this should be a no-brainer. Just put your downloaded mp3 files in your mp3 root, run mp3tofid, rsync, and you're all set.

I'm going the mp3tofid+rsync route myself, not for this (which I refuse to call "podcasting" for religious reasons) but because it's a much simpler solution that I can automate when/if I ever get in-car Wi-Fi working.