Vote for Pi in this poll held by Slashdot.

Below is a list we've compiled of various Pi Day related tags at Flickr. Not everything in these tags is totally related, but most pictures here are related to Pi or Pi Day:

Piday, Pi, 314, 31415, 314159

If you must wear a tie to work, this is the tie to wear on Pi Day. Get your Pi Neck Tie now.

This blog post at Penny Arcade refers to the movie Pi, not the number.

On February 5, 1897, the state of Indiana almost declared pi as "5/4 to 4" or 3.2. While it's fairly common for governmental bodies to legislate weights and measures, this shows that the Indiana Legislature doesn't understand the concept of irrational numbers. It's the irrational part that makes pi so great, in the first place. Coverage of this event includes:

• From the “squaring-the-circle dept.” at Slashdot
• The bill itself, courtesy of Purdue
• Richland College attempts to analyze the claim objectively
• Wired Magazine has the full story