Check WindowsClient.net for updates Some parts of the demos are not available yet in the current build - wait for the next beta Compatibility with Silverlight is important Same tools, designers, code, markup... This summer, .NET framework 3.5 service release Improved setup Fuill install available Also client-focused ~30MB install Parts of WCF Parts of LINQ WPF Deployment of application will be simplified MSI, ClickOnce, XBAP MSDN Reader demoed, looks really good. Source code is available Add-In framework demo HTTP requests, can access cookies in XBAPs and also standalone apps WCF support in XBAPs Lots of 3rd party controls available, check Brad Abrams blog New virtualization model "Recycling virtualization" Uses the same UI elements already created Faster than normal UI virtualization Turned off by default --> must be enabled in code Deferred scrolling enables moving the scrollbar but the UI only scrolls when the scrollbar is released Datagrid demo Won't be as powerful as 3rd party datagrids Read More...