With social signals being so important these days it will be interesting to see the impact that Pinterest brings to the table. I believe that every website now needs an image that is “pinnable” on every page and you need to add a “pin it” button right alongside your Facebook like button and Google plus button. This is especially important if your niche websites target the female crowd because Pinterest is about 80% female.
Interesting comment. I'm hearing about this all over the place. http://live-free-in-an-unfree-world.com