Podcast annoys the crap out of me.
The term is webcast, unless you're specifically targeting iPod users. Most "podcasts" however, target a much wider audience.
Negative. A 'webcast' involves streaming media, with no real way for the end user to go back in time and recapture what's already been broadcast.
Now, 'podcast' is a stupid term, but Apple made it easy with iTunes + iPod so the term stuck. That involves an already completed audio file being committed to disk and publishing its location to an RSS feed. Audiofeed would have been my preferred term for the tech, but I don't get to make those decisions.
They're two entirely different animals.