Macrumors found a recent MacOSX gesturing control panel patent from an Apple employee (formerly of Fingerworks). As they say, this is pretty likely to show up in upcoming builds of OSX and new hardware like the MacBook Pros that should be announced by the end of the month.
They also claim to be able to distinguish between various combinations of fingers, including adjacent and non-adjacent finger presses. In particular, they point out that the pinky finger when applied sideways to the trackpad (as in the bottom of a fist) generates a unique pattern and could be used for its own customizable functionality: such as adjusting volume or putting the computer to sleep.
Putting the Mac to sleep by applying the bottom of your fist? It is so natural!
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