Ok, I can confirm ericf2009's experience exactly.
I needed to use the whole connection procedure from this post to get the Stowaway to connect (ie turn the bluetooth icon blue), and it took me several tries; it is incredibly picky...

Then, once connected, and with the pc105 keyboard hack, most keys work, except the Enter key needs Ctrl-Enter, and the slide-out keyboard must be out.

If the keyboard "goes to sleep" because I'm not using it, I have to run the setxkbmap routine again.

EDIT: even more confirmation of ericf2009's experience. Sometimes the Enter key works fine (no CTRL needed).

EDIT2: More confirmation, the numeric keys won't work after sleep-then-wake until a key is pressed on the internal keyboard, then the setxkbmap is run again.

Thanks for all of the helpful posts, guys.

<sarcastic>And thanks Nokia for making this so easy!</sarcastic>