If I had to guess on the general demographics of the half-dozen or so people that still read these ramblings, I would say the typical reader is in his or her mid 20s, employed and computer literate. Beyond those obvious remarks I would further venture that a typical reader owns a cell phone but not a landline. If I combined the two assumptions of cell phone ownership and computer literacy I believe I could reasonably conclude that my typical reader does not use a traditional paper phone book. But I bet my typical reader still gets one.
Your good mission for the day, should you choose to accept it, is to go to Yellow Pages Goes Green and register your address to halt the delivery of a resource you never use. Besides, you never use that coupon for $3 off your oil change anyway.