As covered here earlier, Dodgeball is a mobile app that helps you navigate your social scene (assuming you live in NYC). Today they launched a new service, Dodgeball Social, which allows you to find out which of your friends are within 10 blocks of you. This feature is super simple and makes a lot of sense to me. I still believe that Dodgeball's time has yet to come. It won't be until they can take advantage of true cellular positioning and real (not email based) SMS delivery, that the service will take off. In the mean time, they're certainly getting all the right features together.