This is quite fascinating: Technologizer has compiled a history of major patents that Apple submitted since its creation.
You'll find jewels like the first Apple II mobo,
the first Apple mouse or the original Bondi blue iMac, some duds (like this virtual rotary dial using an iPod clickwheel) and some wonderful things that never were, like that great example of a skier broadcasting music from his iPods to his fellow skiers' iPods!.