The computer turned out to be quite a useful invention, didn't it?
After initial predictions that there would be a world market for "maybe five computers" (Thomas Watson, IBM President, 1943), the concept gathered pace before exploding into the world-changing device that we now know (and which you're reading this on).
This excellent infographic, constructed by the good people at ebuyer.com, gives a plotted, illustrated history of the evolution of the computer, from the room-sized megaliths of the past, to the sleek machines we see today.
Disappointing not to see the Amiga 500+ in there though. Disappointing.