You can see the Xerox Alto on YouTube...
The Alto GUI was basically a total steaming pile of garbage. It had many, many clever ideas in it, but the first Apple and Windows GUIs were so superior it's not even funny.
People who think that Mac/Windows ripped off the GUI should definitely go and watch those videos (search CuriousMarc). I was personally surprised at how little it had, given the "Jobs copied it" stuff you see everywhere...