Wednesday I installed Visual Studio 2010 Premium, and played a while with the WPF-based editor.
Annoying  thing: I could not select any of the controls on a WPF-Application-Form. Whenever I clicked on the TextBox, the Designer added a Border-Control.

Then I discovered, that the mouse-pointer was not at first position in the toolbox. So I rightclicked the toolbox, and chose “Reset Toolbox”. And there it was again: the mouse pointer at topmost position.

I do not know, why this happend, but now I can choose the controls on a form again.

One more nasty thing: Intellisense was disabled for C#. I had to turn it on manually …