What I would
love is a dual-screen A4 size eInk device. Something I can load up my PDFs on to take with me - if there's one thing I'm always cursing about in the electronics workshop is having to constantly come back/forth to the computer to review technical datasheets - or print them out (which invariably means they'll get lost and printed multiple times).
The other great use, again for the electronics workshop is for me to pull up my assembly guides - one can't be expected to remember the right parts to use across every product every time when there's hundreds of parts involved (Oh how I wish I had a robot to do this for me
).
Paul.