Windows Live Developer Center from Microsoft is now online. A bit sparse at the moment, but, gotta start somewhere. For now it mostly aggregates links to a few of the Live branded APIs and tools: Messenger Activity SDK, Gadgets, Live Custom Domains and ideas.live.com. Interesting Business Opportunities Page. Over the years Microsoft has a good track record of supporting developers and so they do indeed start rolling-out a slew of Live-family APIs this will become a key technical resource.