Now that Facebook has entered the space, Google appears to be ready to take it more seriously , and Foursquare is gaining some real traction, the other players in the location field need to start defining their roles. Of the other players, Gowalla has been doing some interesting stuff around check-in aggregation . But their more interesting play may be around travel. And a small change today points to that. As you can see on place pages for various airports , Gowalla has begun connecting your travels from destination to destination. So if you check it at SFO then five hours later check in at JFK, they know that you were on a cross-country flight and create a new graphic to showcase that, complete with your miles traveled. Below that they tell your friends about your journey. And they're even able to see if you had a layover at another airport.