A brief history of microprocessors
Slashdot alerted me to the existence of an article entitled "Great moments in microprocessor history." It starts out talking (briefly) about vacuum tubes, then moves from the 60's forward, talking about notable chips along the way.
The theme of the article seems to be the idea that, like many other inventions, many advances on the microprocessor front were achieved independently by two or more individuals or groups at about the same time. Along the way, the article mentions the Intel 4004, the 6502 and the 68000, among others. The article definitely just hits the highlights (which is inevitable when trying to sum up 40+ years in a single page) but it's an interesting read nonetheless.