I called Vectren Energy Delivery (a.k.a. the gas company) the other day with a question about my bill, and was pleasantly surprised by a customer service measure they've implemented. When I had made my way through the phone tree to the point where I start to sit on hold, the system said "we'll call you back within the same period of time you might wait on hold - 47 minutes." Then they let me enter a phone number and record my name. Indeed, about 30 minutes later, I got a call back from an automated voice saying "please press 1 when Chris Hardie is on the line", and was then connected to a real person who promptly addressed my concern.
While I sort of question 47 minutes as a reasonable hold time (there was no known natural disaster occurring at the time of my call), I really appreciated having the option of making it their responsibility to follow up, instead of my responsibility to sit on hold. It also means they don't have to keep as many phone lines and support staff active, which theoretically reduces costs. I hope other call centers consider similar measures!