The WPF/E SDK (February CTP) is now available, you can download the files from the MSDN web page. The WPF/E QuickStart is not yet available as download.
If you didn't see this: Renderspace and Microsoft Slovenia have created a very nice example using WPF/E to simulate Windows Vista. Ok, there are a lot of things still missing, of course, but it is very nice to see: http://www.vista.si/
