Since every member of the class has now had a chance to pronounce and speculate about the future of Foursquare's business, this article on how to game the system to get points and badges is particularly timely.
It will be interesting to see how many early adopters stick with Foursquare, or whether check in fatigue turns out to be a reality. Chances are, it will all depend on whether real, tangible rewards begin to be developed beyond the badges and points.