I was just listening to Barton Seaver's TED Talk, and he mentioned Monterey Bay Aquarium's seafood pocket guide, so I checked it out. The guide recommends ocean-friendly seafood choices. What a great idea! Just print a guide out, keep it in my wallet, and check it the next time I buy seafood at a restaurant or the grocery.
By the way - a great way to organize podcasts in iTunes is to setup a "smart playlist"
"Genre contains Podcast AND Plays is 0".