Figured someone else would beat me to it, but even so now it's out there.
I always this bit of "Pinky and the Brain" on this day: http://www.youtube.com/watch?v=S7pNAddsQk8
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Posted 14 March 2011 - 07:18 AM
I've heard the "hip" thing is to now call is Half-Tau Day.
Tau is often used to represent 2pi
But yes, Happy Pi Day indeed!