Wow – Operating System Interface Design Between 1981-2009 is awesome (thanks Dave). It is a screenshot from every major graphical OS since the Xerox Alto. Some old favorites of mine include the Apple Lisa (1983), the Amiga Workbench (1985), Geos (1986), NeXTSTEP (1989), and OS/2 2.0 (1992). At some point in time I had a computer that ran these and/or installed them on a computer of mine.