Innobec Technologies have just released a beta version of there software Sidewindow.
It allows you to use a Windows based PDA as a second monitor and extend your desktop onto it.
I have played around with this and it works fine on my Axim x50V.
Now down to the good stuff

How hard would it be to take one of the apps for displaying a CP layout in mame and forcing it to display on a certain monitor number EG the PDA screen.
So say in Mamewah, You launch a game and on your main monitor it displays the game but on the second monitor/PDA screen it displays a pic of your CP and the controls for that game.
I think this would be so cool if I could use my old Ipaq for something like this and mount it in my CP.
Thank you
LB