Re: I've said it before...
I've helped bring products to market by using solid modelling CAD on a laptop, and that was a few years back (there are phones with as much RAM now!). Yeah, I was designing a kitchen device, and not a power station or battleship, but hey. I haven't yet seen a brilliant CAD interface for tablets, but I have no reason to believe it can't be done.
Anyway, I can imagine lots of real work being done on a tablet, from site surveying (Leica Instruments make equipment that interfaces with iDevices) to audio mixing.
I really thought this 'real work' gripe has been put to bed some time ago.