OpenSocial has been... extensively covered in just about all media over the past few days. The official site is up, and the video from the Campfire 1 announcement as well.
Obviously this is just a first step. We're all trying to build a self-sustaining ecosystem, and right now we're bootstrapping. It's a bit like terraforming: We just launched the equivalent of space ships carrying algae :).
A key next step is making it easy to create social app containers. It's not hard to build a web page that can contain Gadgets, though it could be easier. Adding the social APIs, the personal data stores, social identity, and authentication and authorization makes things a lot more complex. This is the part I'm working on, along with a lot of other people. It's a problem space I've been working in for a while on the side. Now it's time to achieve 'rough consensus and running code.'