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OAuth is becoming a very popular way to control authorized access to Web APIs and the data that they return. Although it's one of the most straightforward ways to accomplish this, it's still rather confusing to use. If your API uses OAuth, then you need to be able to describe it so that developers can quickly understand what they need to do.
App.net, Dalton Caldwell’s proposed ad-free Twitter-alternative, has launched an experimental Developer Incentive Program to financially reward developers that create innovative and popular applications using the App.net API.
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.