Miranda Sawyer explores the world of podcasting, rounding up some of the best spoken word audio from around the world. This week: The comedy episode. Richard Herring discusses the freedom the medium allows comedians and ponders its impact on mainstream media. Adam Buxton reflects on his new podcast and dreams of interviewing David Bowie for it. Also featured are New Zealand comedians Tim Batt and Guy Montgomery, whose podcast The Worst Idea of All Time is about their experience of watching the same tedious film every week for a year. The podcast's reached cult status - but how have they managed to get through it? Producer: Jim Frank Researcher: Chris Pearson.