I can't stand Penn. His arrogance is overwhelming.
Love StarTalk that was mentioned a few posts back. Anything with Neil deGrass Tyson. I just type his name into iTunes and download just about anything. Same with Bill Nye.
Maybe I just like people that believe the global warming science and don't like the deniers.
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As mentioned previously in this thread, I typically use podcasts to fill the time when I'm swimming at the local pool. Since Real Time with Bill Maher (another climate change believer) was off for most of December, I've been searching for alternatives to fill the void. I've been listening to TV Ontario's "The Agenda", "Point of Inquiry", "TED Talks" and a few others. I tried to listen to "Imaginary Friends Show" and got five minutes in before deleting it as I did with "The Humanist Hour"... both seemed very unprofessional. People were trying to talk over each other, people laughing at their own jokes more than anyone else, etc..