This sounds like a promising service for people who try to reach customer service at almost any business, and end up being put into what amounts to "Forget" or "Ignore" mode.
"A new company, LucyPhone, is offering a solution: when put on hold, users can hang up, and are then called back when a customer service representative finally picks up. On the free service’s Web site, LucyPhone.com, users type in a customer service number (or click on one of many stored on the site), as well as their own. The company also has submitted a free iPhone application to Apple, which it expects to be approved soon."
This idea could eventually be worth billions to the inventors.