I found this article on OSNews: A History of Apple’s Operating Systems. The article starts with the Apple II and works its way up to Mac OS X, touching all the various branches in between – as well as Apple OSes that never quite made it out the door, and other OSes – like NeXtStep (whatever the capitalization is) – that influenced it on its way. Hey, where else are you going to find screenshots of the Apple I and Macintosh System 1?

It’s a fascinating read. I suspect the site will be due for another Slashdotting soon…