Ricky Gervais, a famous British comedian (from the BBC sitcoms "The Office" and "Extras") has a free podcast which is actually the number 1 podcast in the world today.
The podcast--which is audio only--has just completed Episode 8 of 12. It is updated weekly and each episode of the radio broadcast is roughly 30-35 minutes long. It is the funniest commentary I've heard in at least five years. It is basically three British guys talking about common sayings, news, and various issues involving animals. I'll leave it at that since a description can do no justice to the meandering nature of the broadcast.
If you don't like the podcast format, the website for the show has free mp3 downloads of all of their episodes. For more information, see http://www.guardian.co.uk/rickygervais.