Here's an interesting article.
http://seattletimes.nwsource.com/html/b ... ign16.html
Amazing what Microsoft will do just to make a decision. I remember reading about all of the goofy **** they did back when they were designing the interface for Windows 95, about how they decided to put the "Start" button at the bottom of the screen because it was more natural of a movement to "pull" than it was to "push".