I voted "Really what is a..." cause it was the best option. I know they were popular a few years ago, but really, people still use these?? It's free and certainly low cost to produce so my answer would "why not?", but it's never something I'd personally use.
As an aside, I'm one of the top posters on crackberry... and been on the site for a couple years now... and never once listened to a podcast.