Official Tumblr Objective-C SDK by Tumblr. It provides interaction with the API along with the resources to work with CocoaPods and access documentation. Includes OAuth and xAuth, API client, inter-app communication, and URL schemes. By Bryan Irace.
There are a number of ways of delivering data in real-time but until recently it has looked like PubSubHubbub, with the backing of Google, was going to be the preferred method. However, the past couple of weeks have seen a couple of interesting developments which could indicate that the developer community may actually prefer HTTP Streaming.
microPledge enters the emerging market for small scale financial services. This service allows everyday people to contribute to a common goal that requires something more than higher ideals: money! It is geared specifically toward software development, which makes the microPledge API a niche offering.
Twitter, Facebook and LinkedIn have some new company. The Klout API is launching a new service to "sign in with Klout." Called KloutPass, it gives developers access to user influence data at the moment someone signs in. It also gives Klout the opportunity to be a stealthy player in the coming identity wars.