A friend sent me a link to an article about the best seafood options. If you eat seafood, there are some ways you can do it most sustainably. Here's my two-cents on interpreting the article: My favorite seafood choice guidelines come from the Monterey Bay Aquarium. It looks like they are referenced in the yahoo article.
My only caution would be to be sure that you are choosing US farmed salmon, as opposed to just any farmed salmon. I'm not eating seafood anymore, but when I did, farmed salmon made me sick. Maybe it was imported? Also, I would be careful to ask about this distinction when ordering at a restaurant. Restaurants may be using imported farmed salmon.