I remember the day I first heard the word 'podcast'. It was 2005 and the Simon Mayo Show was on BBC Radio 5 Live. Simon, one of the best broadcasters in the UK, was referring to a programme called 'Pods and Blogs' - a round-up of the new podcasts and blogs being produced around the world. I'd not heard of either word before. Blogs, I eventually worked out, involved people banging endlessly on about a subject in the written form. Pods were the same, but in downloadable audio form. I didn't expect to be interested in either. Then I discovered The Ricky Gervais Show.