Aaron,

> How hard would it be to get FFI working on the WinCE VM? 

How good is your working knowledge of Arm assembler and the WinCE ABI?!

> I'm particularily interested in the Handheld PC 2000 VM ARM
> (platform I'm using now) and the PocketPC ARM VMs.  Should FFI
> be easy to get working in WinCE?

See above. If you know what you're doing it's a matter of days (at
most). When you have a specific target, all you need is a little bit of
inline assembly code (see the Win32 and MacOS versions).

Cheers,
  - Andreas