Gizmodo has posted what they are calling the Ultimate Gameboy Timeline. It is a great condensing of the history of the ubiquitous platform. I would say it is the most definitive timeline to date, but not ultimate (example: no listing of the untimely death of Gunpei Yokei). Of course, maybe they were just trying to focus on the positive. Oh, well.
Properly printed, I think this would make a great addition to any cubicle.