As Tim Sneath puts it , the WPF team made a very special announcement in their WPF3D Team Blog  and released the 3D Tools for the Windows Presentation Foundation  as a free, open-source download on CodePlex.
These tools allow you to create WPF applications with 3D user interfaces - where you can use the well-known controls like sliders, text boxes, etc. and hit testing, hovering etc. just works!
Hopefully people we will not get the same effect which appeared after the first version of Visual Basic where all buttons got pink just because all of a sudden it was extremly easy to specifiy a color for it...
So use the new feature set wisely and in a decent manner!