I was just about to recommend listening to Just a Minute (best ever comedy show on Radio ever) when I realised that a) there isn't a podcast of it and b) the current series has just finished.
However, if you're into "topical comedy" there's something else: The Now Show is back! You can download/subscribe to a podcast. It's probably more for the advanced learner and it will definitely help if you have at least some knowledge of current affairs. Otherwise some of the humour will be difficult to understand.
