Keymaps for Treo or other PDA cell phone?

There is a piece of software called SPB Keyboard for Windows Mobile
devices that supports a number of different keyboard layouts including
Dvorak. It is a replacement software keyboard for Windows Mobile and
has a full-screen, landscape mode that is supposed to allow touch
typing.

I used it on an HTC Touch (a.k.a. T-Mobile MDA, HTC Elf), which has no
hardware keypad and relies solely on the touch screen for user input.
I found the software a little unresponsive and hard to use mainly due
to the PDA's processing power. But maybe with a faster device with a
slightly larger screen it could be good.

You'll find details of the latest version of SPB Keyboard at
http://www.spbsoftwarehouse.com/products/fsk/.