Interesting stuff, although you could go back to this:
http://en.wikipedia.org/wiki/Xerox_Alto
The first computer (I think) that used a graphical interface.
The paragraph is interesting:
-------------
In 1979, Apple Computer's co-founder Steve Jobs visited Xerox PARC, where he was shown the Smalltalk-80 programming environment, networking, and most importantly the WYSIWYG, mouse-driven graphical user interface provided by the Alto. He reportedly was not impressed by the first two, but was excited by the last one, and promptly integrated it, first into the Lisa and then in the Macintosh, attracting several key researchers to work in his company.[4]
----------
I'm sure lots of companies have used other companies ideas.