I found PDAs too slow and unstable. It's not Phojo it's the operating system - Windows Mobile has just too many glitches and bugs, some from Microsoft some from the PDA maker in the firmware...Phojo worked quite well when I demoed it but the PDA was slow reading these huge 12 megapixel files, even though I had a model with 128MB ram and CPU faster than many current models...
Right now, I am leaning towards these subnotebooks with 7", 9" and similar screens. Under 1 kg, big enough display, full speed and still as small as a paperbook, not as much as PDAs but not much bigger with full functionality of Windows XP, integrated harddisk and full (albeit very very small) keyboard. Or get one of these UMPCs, with touchscreen but no keyboard, even smaller, run Windows XP/Vista too.
And there are credible rumours that Apple will release a subnotebook this year, maybe with 10" display.
Slower but still adequate models can be gotten "cheaply".
And they run photomechanic ;-)