Of the dozen or so podcasts I listen to each week, my firm favourite is BBC Radio 5 Live's film reviews by Mark Kermode (grumpy rockabilly weirdo with a doctorate in filmology and a wife who's a published authority on trash porn). The show can also be watched live, which is how a YouTuber has helpfully intercut last week's review of Iron Man, complete with Kermode's mocking impressions of the three main stars, with footage of the film. It's short and stupid but tickles my funny bone. I'll never be able to watch Gwyneth Paltrow with a straight face ever again.
See also: The BBC's resident grumpmeister