We've been waiting all day for Google's OpenSocial site to start working, and it has finally happened.

The site contains the official OpenSocial API documents, developers blog, featured community gadgets, and featured videos. Unless you're a developer dying to see the inner workings of the APIs, there isn't really much new information up there; everything's been extensively covered here at Mashable.

The list of partners mentioned seemed to have grown a bit: Engage.com, Friendster, hi5, Hyves, imeem, LinkedIn, MySpace, Ning, Oracle, orkut, Plaxo, Salesforce.com, Six Apart, Tianji, Viadeo, and XING. Yes, that's MySpace there in the list; Facebook is, unsurprisingly, nowhere to be seen.

Google has also included a couple of tutorial-style articles to get developers started. These include: "How To Build Your First Social Gadget", "Gadget Tutorial", "Social Design Best Pratices" and "How To Read and Write Shared Social Data".

*update: upon careful review of the OpenSocial FAQ, it seems that the folks at Google have been a bit too eager to point out one of the main advantages they have over Facebook Platform, so they've included it twice.