If you surf the web today, you'll see lot's of references to 3.14. Google's homepage has a nifty logo:

Around Princeton there are lots of events to celebrate Pi day, which is also Albert Einstein's birthday! Stop by Palmer Square at 3:14 today and you might get a pie thrown at you! Or if you would rather do something less messy, visit the Trenton Sculpture Grounds and wander through interactive art which includes a stone Pi.