Following Apple patents can be a mind-warping experience, but everyone once in a while they patent something so compelling that I just have to mention it.
Here's how Information Week describes some of Apple's new touch screen patents:
The fingerprint detector would make it possible for a person to initiate commands on a device through the use of a particular finger. For example, the system could detect the unique fingerprint on the middle finger to play music, or the touch of a person's pinky could fast-forward or rewind music. The variety of commands could be increased by launching functionality by double tapping with a particular finger.