My most recent read is: How to Get a Meeting with Anyone by Stu Heinecke. A client suggested the book. It may be more about sales than marketing, but it sheds much light on what Heinecke calls Contact Marketing. I've called it 3D prospecting, where you send a few prospects a 'thing' to get their attention. We've sent custom engraved magnifying glasses, super-soakers, Santa Claus (to hand deliver things), boxes of wood samples, etc.
Generally, it does result in a phone call. Good stuff.