Sharp Wizard OZ-7000 (1989)

It didn't quite fit into a shirt pocket, and its non-QWERTY keyboard wasn't the most intuitive of input devices. But long before the PalmPilot 1000 (#4) or even the Newton MessagePad (#28), the first Sharp Wizard helped popularize the concept of a small, lightweight electronic address book and calendar, thereby becoming the granddaddy of the modern personal digital assistant. Want to read more? The Open Directory Project has a page full of Wizard links. Photo courtesy of Sharp.