Of course one the first things I downloaded onto it were gardening, green living, and cooking podcasts (free) and the best one I found was Gardenfork. It was informative, funny, and I felt like I was visiting with an old friend. Actually, the host reminds me of a good friend from high school who now lives near San Fransisco.
I actually found it on the web as well, so if you are interested you can watch episodes of Gardenfork here.
In case you're interested in viewing an episode here is one from YouTube about making yogurt in a cardboard box.