Gluestick is a simple object-oriented implementation of the Glue API for PHP. It takes advantage of PHP's magic methods to make a more intuitive interface for developers: rather than learning a new set of methods, you just use Glue's native meth
Gowalla, Foursquare, Yelp, Facebook Places, the list goes on. There's certainly no shortage of methods to tell people where you are and what you're doing while you're there. Startup Whatser, built on the SoGeo API for location-based apps, has jumped into the ring with a different approach to check-in services: to be useful.