Hotmail Founder Launches Flex Based Microsoft Office

Ten years ago, Sabeer Bhatia co-founded Hotmail and sold it to Microsoft for just under $400 million. Now he's launching a Flex based competitor to Microsoft Office called Live Documents. So far the site isn't allowing registration, although you can sign up for an invite as everyone else has. It does sound interesting - plugins into the Microsoft Office applications allow you to enable them to work with Live Documents, and what sounds like a browser based interface (though possibly leveraging Adobe AIR as well) allows you to collaborate and work on your documents from anywhere.