Oh, there is a search button! I looked and looked but did not notice it being right there at the top of the page and everything! A big Doh! on my part.
Thanks for the links. The note on the first page makes it sound like you need the porting kit to extend the emulator to support custom hardware:
If you have the .NET Micro Framework Porting Kit, you can use managed code to extend the emulator so that it supports your own hardware. When you do so you must reference Microsoft.SPOT.Emulator.dll and Microsoft.SPOT.Emulator.Interface.dll, which are now shipped in the tools\build folder of the porting kit. [/quote]
Glancing through the rest of the docs it does not appear that is the case however. Extending the emulator to support the FEZ hardware might be an interesting community project.