You can get Palm pilot keyboards working with Newtons with a special adapter (I think you can buy this or make it yourselft - there are good instructions on the web) and a special driver you can download for the Newton.

FWIW I haven't tried mine yet but there are plenty of people out there who report that it works well. I would have preferred a Newton keyboard but they are not that common in Australia (and the Palm Stowaway keyboard is very cool).

I guess I should post pictures at some point...