Not cooking, but I LOVE 'Vegetarian Food For Thought' by Colleen Patrick-Goudreau.
'The Alternative Vegan' is a great cooking related podcast. The host is Indian and focuses on simple ethnic meals, among all sorts of other food-related stuff.
'Animal Rights: The Abolitionist Approach Commentary' is a short lecture series by Peter Singer. It's super interesting and though I don't always agree with him, he gives my brain good exercise and I dig that.
'Animal Voices' is a radio show out of Canada. It's not my favorite, mostly interviews but there's been some really good stuff on there (the interview with the author of Just Food is *really* good)
And then there's always Vegan Freaks! They're a bit intense/freaky for some people, but I <3 them.
Hope that Helps!