Many of us have heard of Sirius and XFM by now, which are satellite radio stations. Satellite radio is attractive to many people not only because listeners can get hundreds of stations rather than the 10 or so in their immediate area, but due to the gigantic footprint of a satellite, it's possible to listen to the same station while driving across an entire continent. Maybe that's a slight exaggeration, but there's no doubt that even a small satellite footprint is many times larger than a typical Fm radio station.
Since satellite bandwidth is pretty pricey, generally only the big guys like Adam Curry are on the beam, but now the average podcasting Joe or Jane can pay a single shiny (in Canada) dollar per minute and get their podcast broadcasted on the Podsat.net satellite.
The big difference between Podsat and the others is that there are no subscription fees for Podsat. Yes, listeners will need a proper satellite receive radio thingy to tune in, but unlike Sirius and XFM that's where the costs stop.
Be aware that unless your shows are under 20 minutes, then you're going to have to sign up for at least four shows.