For those who dislike common ignorance, try the Skeptics’ Guide to the Universe. This is more entertainment than survey, but all the same there are often good, well–informed & entertaining discussions.

I’d be interested to find more good science & engineering podcasts, ideally surveys with a sense of humour a la Quackcast. For example, Microsoft produce some very interesting computing science podcasts, but unsurprisingly these are orientated towards their products.