Last year Dropbox announced a preview of the new Dropbox API v2. The new version simplified the Dropbox developer experience. In hopes to move toward a more simplified platform, Dropbox also announced deprecation of its Sync and Datastore APIs.
Recently we wrote about the wonders of PubSubHubBub and what was possible when services push data, in real time, to external web apps. Twitter's Stream API makes it clear that we're headed towards an exciting and very real-time web. Now YouTube is along for the ride.