This appears promising - TED Talks
Each year, TED hosts some of the world's most fascinating people: Trusted voices and convention-breaking mavericks, icons and geniuses. The talks they deliver have had had such a great impact, we thought they deserved a wider audience. So now - with our sponsor BMW and production partner WNYC/New York Public Radio we're sharing some of the most remarkable TED talks with the world at large. Each week, we'll release a new talk, in audio and video, to download or watch online. For best effect, plan to listen to at least three, start to finish. They have a cumulative effect..There is an ITunes subscription link from that page as well. As if I don't have enough interesting stuff in podcast format as it is.