The Monterey Bay Aquarium regularly updates their Seafood Watch, which is a guide to sustainable seafood consumption. I used to get several copies of the handy little pocket guide from my husband David, who was part of a team that designed a recent remodel and addition to the aquarium. After the project ended and he stopped having regular access to the newest pocket guides, I started downloading a pdf of it from their website, which wasn't as small or as colorful (well, I guess it would be if I had the patience to print it out in color and cut along the dotted line), but still did the trick. But now they've come up with an iPhone app. It's colorful, up-to-date, and best of all, you can SEARCH. I love it. You will love it. Spread the word.
Urchins seen on recent beach visit, probably not edible.