Old news now of course :-) but surely the most devastating/interesting/wonderful technology announcement this year. Scoble has a round up of all the best bits on the new Google OpenSocial API that every social networking site on the planet is signing up to.
Open Social is available here.
Plaxo, Ning, MySpace, Beebo, Six Apart, Orkut, Salesforce, LinkedIn, Friendster, Oracle, Engage, the list goes on (via TechCrunch).
Incredible. Perhaps even scary.
Marc Andreesson comments (with screen shots), as does Dave Winer (here and here) and Dan Farber.