There are a lot of gadget-examples with WPF/E! Nice - but not more. Flash V. 1.0 :-)
WPF/E does not even contain a Textbox control at the moment. It is in a really early stage. So don't be disappointed. According to this thread, Microsoft is working on adding basic control (TextBox, Checkbox, ...) in the next CTP. Then we're getting closer to business needs.
In the meantime, Tony Lombardo from Infragistics did realize a cool combo (WPF/E and MS AJAX) - a "WPF/E Textbox". Take a look. An enthralling technical chat about WPF and WPF/E to gain insights: