Goodwill has a legal meaning, quite apart from those mentioned thus far in this thread. Goodwill is an intangible asset of a business enterprise, which explains why its value may be more than the sum of the value of its tangible assets.
Fr. Steve, you took the words right out of my mouth! When David and I bought the pet store, about half the purchase price was for "goodwill". When my father sold his cranes to another company, the company hired him as well in order to get the goodwill, because they figured my dad's customers would go to the company where he was working.