Just in case Pi Day is new to you, we thought we'd list out the top Pi Day activities for you, so everyone can celebrate Pi Day this year:

1. Bake a Pie with the symbol Pi on it, measure its diameter, calculate its circumference, and eat the Pie.
2. Use a piece of string to "prove" Pi by measuring other circles' circumference & diameter.
3. Recite as many digits of Pi as you can as a team taking turns, or have a memorization contest and the winner gets to eat Pie first.
4. Send your friends Pi Day eCards to remind them it's Pi Day.
5. Give everyone a "High Pi" instead of a high five.
6. Get creative and write a song about Pi, or listen to music based on Pi.

Read what other people's favorite Pi Day activities are and add your own.

Happy Pi Day 2009!

Also in the news, London's Times Online covers Pi Day, but also has a very cool archived article from 1961 about calculating digits of pi, whose headline declares "Pi Can Never Be Worked Out".

San Francisco's Exploratorium hosts their annual celebration of Pi Day at their Pi Shrine where they perform pi-related rites and eat ritual food.

BuzzFlash covers Congress's recognition of National Pi Day.

Read more about National Pi Day at CNet News.

• The Inquisitr is following up on Square Root Day with a collection of more Pi Day stuff.
• The Pi Day Challenge is a series of puzzles that are logic based. A team of logicians adapted or created these puzzles – some require research, some require mathematics, some require pure savvy.
• TheoremOfTheDay.org has a special theorem prepared for Pi Day: Download the PDF.
• eCalc is a powerful scientific calculator for Windows or Mac, and they're offering a Pi Day special, where you can buy it for $Pi.
• National Geographic Magazine interviewed Larry Shaw about Pi Day.
• Finally, the first ever Maker Event for Scotland will be held on Pi Day. It's called McMADSAT (for make and do, show and tell) and they'll have fun making cool things and exchanging technology skills at the Glasgow Science centre.

House Resolution 224 - Supporting the designation of Pi Day ends like this:

...Whereas Pi can be approximated as 3.14, and thus March 14, 2009, is an appropriate day for 'National Pi Day': Now, therefore, be it

Resolved, That the House of Representatives--

(1) supports the designation of a 'Pi Day' and its celebration around the world;

(2) recognizes the continuing importance of National Science Foundation's math and science education programs; and

(3) encourages schools and educators to observe the day with appropriate activities that teach students about Pi and engage them about the study of mathematics.