Blend 4 supports not only Silverlight, WPF, and Windows Phone, it now includes multi-targeting support for .NET framework 3.5sp1 and 4, Silverlight 3 and 4, and Silverlight for Windows Phone, just like Visual Studio 2010. In this video, Pete Blois goes into some detail about how they’ve accomplished multi targeting in Blend 4. Pete also talks about “Rooler,” the screen measurement and sampling tool created for designers and developers written in WPF. Finally, we get into new Blend tooling for Windows Phone Series 7 development: