Maybe a Peg in a
PC-104+ formfactor would be a solution?
That is small enough for anything maybe except the pda(you could make a pda of a pc104 board but it might be a little bulky)
Industrial, STB, thin client, laptop, pentablet, pda, pocketvideoplayer and wearable all from the same board, wouldn´t that be favorable when it comes to massproduction?