The Joy of Pi
Book, digits, links, facts, and quote.

The Ridiculously Enhanced Pi Page
Information on links for Pi Day.

The Pi Trivia Game
History, math, and physics questions.

pi Mathematics
Teacher resources, history, activities, and information.

A Slice Of Pi
Digits, chronology, expressions, other constants, maths books, fractals, Rolling Stones lyrics, and computer games.

Pieter's Pi Memorizing Aids
Memorizing aids.

A Tribute to Pi
Club and information.

Pi Memorama
Includes a program that teaches Pi for the Mac, a page on why people learn to recite Pi and pages on how to memorise Pi.

Dale's Pi Page
Includes history of Pi, songs and jokes, poems, news and the first 1,000,000 digits.

Your Piece of the Pi
This site describes pi's history, characteristics, and application. It also includes a distributed computing application for finding a large number of digits.

The Friends of Pi Club
News, club, links, and information.

One Billion Digits of Pi
Ramanujan, modular equations, and approximations.

How Stuff Works: Pi
Animated graphic helps to explain Pi and the different ways of calculating Pi, with some related links.

Pi Through the Ages
History.

History and Philosophy of Pi
Probably no symbol of infinity in mathematics has evoked as much mystery, romanticism, misconception and human interest as the number and Greek letter of Pi. Interesting facts and trivia about Pi.

How pi?
Extracting the digits of pi from the SlOka

A Common Book of Pi
Includes a brief history, a page with different formulas and a list of references.

The Constant Pi
History, formulae, algorithms, programs, records of computation, and references.

Paul's Page of Pi
Includes introduction on why people would want to calculate Pi, four methods for calculating it, over 8000 digits, poems and music.

Greg's Page of Pi
Includes introduction to Pi, 3 pieces of Pi art and links.

Earth Mysteries : Notes on Pi (¼ )
An introduction to the number Pi and its history.

The Uselessness of Pi and its Irrational Friends
Clubs, links, memorizing technique, records, art, and programs.

Pi World Ranking List
Every sport has its championship. Every sport has its world ranking list. For many who like to memorize numbers, PI is the ultimate number, and it makes sense to create a list for people to get in touch and learn where they stand in the world of memorizers.

Science News Online: Pi à la Mode
An article describing a potential link between two disparate mathematical fields-number theory and chaotic dynamics-that could lead to a proof that every digit of pi occurs with the same frequency.

Randomly Distributed Slices of pi
An article by Charles Seife about how mathematicians slowly circle in on a proof that pi's unpredictable digits really are as random as they seem.

Is Pi normal?
An article by Stan Wagon about the idea of normality, first introduced by E. Borel in 1909, is an attempt to formalize the notion of a real number being random.

The Magic Piworld
Provides generated pictures and personal signs out of digits of Pi. Also a Picture Gallery, PiSign, PiPhonie.

Ancient Pi: Knowers of the Universe
The concept of pi refers to the constant ratio of the diameter:circumference of any circle; irrespective of the number of degrees contained within that circle. An article in the "Science in Ancient Artwork"-Series by Charles William Johnson.

Ask Dr. Math - Pi
Dr Math answers over 60 questions submitted by people about pi including questions on the Bible's relationship to it and its relationship to trigonometry.

Lucy Scale Developments
Pitch, Pi, and other musical paradoxes.

Archimedes' Constant
Information about the constant and some mathematical discussion of the effects.

Calculating Pi
An open source endeavor for the calculation of this constant. Describes the project, the implemented algorithms for calculatinon and software downloads.

The Pi Pages
Information on Pi, its history, its future, and the people involved in its calculations.

Pi Approximation Day
22/7 - that is, July 22. For the past few years, people at Chalmers University have celebrated it.

Elias' Pi Page
Includes Pi in the Binary number system, Pi as a sound file and Pi shown in different images.

Pi Patterns
Images and illustrations created by using the digits of the circle constant.

Archimedes and the Computation of Pi
A page that contains links information on Archimedes and an interactive applet that illustrates how he estimated Pi.

A New Approach to the Universal Constant "pi"
A text that tries to prove that pi is 3.1416 exactly.

Ask Dr. Math: About Pi
Explains what the constant is and a brief history. Includes resource links.

Fabrice Bellard's PI page
Showcases digit extraction and FFT multiplication algorithms.

Pi Land
Fun activities, a Pi trivia game and a Trainer for digit memorization. Pi poetry, artwork, and photography, calculations, digits and book reviews.

Indiana Pi Bill
Bill proposing new value of pi.

Bailey on Pi
Briefly explains David Bailey's work with NASA's supercomputers and the development of a workable formula to evaluate Pi for any number of decimal places.

Land of Pi
Pi digits, random links, and some downloads.

Pi 3.1416
Mathematics as the language of nature.

Fun With Pi
A Topica email list. Archives readable by anyone.

Archimedes' Approximation of Pi
Describes the method introduced by Archimedes for aproximating Pi.

The 1000 billionth binary digit of PI is '1' !
Announcement of the 1000 billionth digit of Pi.

Buffon's Needle
An analysis of it's relation to Pi and a simulation by George Reese.