My uncle recently retired as a plumber. He is in his mid-60's, and the physical part of the job got to be too much for him. Imagine a service like oDesk where my uncle could sit in front of his computer and be paid by the hour to consult with DIY-ers on their plumbing problems. A guy with a leaky faucet could wear a camera on his head, and my uncle could give him instructions as he took the thing apart. Let's say 1/2 hour of consulting was required @ $50/hour. My uncle would be delighted to earn even 2/3 of that in retirement, and the guy doing the work would have less applied time than if he had to wait at home to let the plumber in. Furthermore, 1/2 hour is less than the plumber's expected commute to the customer's house.
How many in-home shadow work tasks could be done more efficiently if the physical labor was separated from the knowledge aspect of the work?