Wow, what a few months. A wedding, a trip to Africa, and a tumultuous return to work that included a last-minute invitation to sit on a panel at the semantic web conference. Unrelated to all of this I’ve been spending a lot of time thinking about location-specific mobile applications. Foursquare, Gowalla, MyTown, Yelp! and other apps have people checking in, buying places, and generating a lot of structured data tied to location and community.