I've been listening to podcasts and watching videos a lot on my phone. My current favorites are TED Talks and the Scientific American Podcast.
J.J. Abrams' mystery box
Isabel Allende tells tales of passion
A.J. Jacobs, My Year of Living Biblically
Keith Barry does brain magic
Michael Moschen juggles rhythm and motion
Amy Tan on creativity
The Jill and Julia Show
Pamelia Kurstin plays the theremin
Michael Pollan gives a plant's-eye view
The Long and Winding Road: DNA Evidence for Human Migration; Plus July Issue Highlights
One Singular Sensation: Will We Upload Our Brains, and Other Questions Related to "The Coming Singularity"
I liked the SciAm Podcast about giant pumpkins, but I can't find it on their site. In iTunes you just get one big list of titles. Much easier.