The thesis hasn't changed. It was and is:
Apple does the bulk of the innovating in the computer industry wrt what constitutes a base machine configuration. They've forced into the mainstream mice, GUIs, networking, peer to peer networking (about to get good again with Rendezvous), wireless ethernet, classy cases, hotswappable high bandwidth media (firewire), flat panel displays, multimedia, sound, and a bunch of other stuff thats small but that everybody has since copied. Which is fine. This is all stuff that changed the face of computing - the very definition of what a computer is to a user.
Light pens didn't change jack and are not commonly found on the average computer. Do you not understand? You're beginning to resemble bryce on this. Stay on topic.