Well I think it is very very possible for PlaneShift to be run by a PDA or iPod/iPhone/iPad, having the game have a far lower requirement, such as graphical ones, grass, shaders, shadows, just a basic texture and wall and object. Races will probably need some more mobile work, but can be done.
A communications box, inventory, settings, states and skills, information, petition. That is about it that is of most importance. I would probably say you click on the crystal to open the toolbar then pick what you want to open, then the toolbar hides again. Communications and shortcuts will be very small, the tabs will probably need to be cut down into System, Main, [of choice], other. [of choice] will probably automatically be Channels and people can change it to Guild, whispers, alliance or whatever. other you will click on and it will pop up next to it guild, alliance, whispers, auctions, group, etc.
This shouldn't be to hard to do. Just a full GUI restructure and some things in the requirements to be lowered.