There is a new review, opinion and photo social service. This one is from the folks at Milk, their first iPhone app. After you download and get your confirmation email, you can start building your street Cred. Which is to say, posting reviews of things you know something about and other people seeing you as knowledgable.
Social services on the iPhone are difficult to do when having to show both text and photos. It will be fun to see how many folks jump in with their photos of what they enjoy and see if it matches up with my thoughts too.