Thunderbug
I own an even humbler Psion 3c and have writen a couple of programs, and I'm in the the same 'boat'.
I don't know whether to go for a Palm or IPAQ.
The only software I can find is
Appforge BUT at $900
Unless of course anybody knows of any freebies?
There is a 30 day trial available, but it would take me that long to get used to it.!