Ooh, Ballmer keynote!
But, besides that...
here wrote:Developers can dive deep into the latest Microsoft Web technologies, including Silverlight, Internet Explorer 8, "Atlas"/AJAX, ASP.NET, Windows Cardspace, the Windows Presentation Foundation, Windows Media and others. Want to learn how to code pages for IE8 that render properly in other popular browsers? Interested in building AJAX sites quickly and efficiently?
Here's to hoping there's a public beta released at Mix.