I'm a podcast junky. I travel a lot, and even when not traveling, I spend a lot of time on public transportation or in cabs or waiting for meetings and when life forces me into little wedges of time which are neither productive nor relaxing, I think nothing beats a pair of headphones and a brilliant lecture or interview.
One of my absolutely favorite podcasts comes from the London School of Economics. LSE Public Lectures showcases the leading academics, writers, scientists, politicians and diplomats who come to speak at that esteemed school, and the results are often astonishing. While sometimes the talks are clunkers -- mired in jargon or diplomatic niceties -- far more often LSE talks feature brilliant, incredibly well-informed people sharing what they think in extremely direct, candid and intelligent terms. They're brain candy for people who care about trying to understand how the world actually works.
I regularly learn something listening to these talks. Perhaps you might like them too.