I believe Penn's position is one of nontheism. Agnostism (as I've understood it) implies that the existance of god is unknowable, but potentially very important. Nontheism implies it is conceivably knowable (in which case Penn would be proven wrong and would learn something interesting - along with the rest of us!) but whether or not god exists is irrelevent to our existance.
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Date: 2005-11-21 02:46 pm (UTC)Wikipedia has a lot to offer on the topic: http://en.wikipedia.org/wiki/Nontheism