 Which idea irritates you because it has not been taken far enough?
teeja: Voice-command computing.  As Scotty said, "A keyboard? How quaint!"(NOT for offices!) I want to tell my wearable to look up facts, do math, remember everything I tell it to remember, and comb through ALL the news keeping my personal preferences in mind. And quick instructions on what I can cook with the food I've got on hand ... which it remembers.