The Joy of Pi  
   Book, digits, links, facts, and quote.
   http://www.joyofpi.com/

The Ridiculously Enhanced Pi Page  
   Information on links for Pi Day.
   http://www.exploratorium.edu/learning_studio/pi/

The Pi Trivia Game  
   History, math, and physics questions.
   http://eveander.com/trivia/

pi Mathematics  
   Teacher resources, history, activities, and information.
   http://www.ncsa.uiuc.edu:80/edu/RSE/RSEorange/buttons.html

A Slice Of Pi  
   Digits, chronology, expressions, other constants, maths books, fractals, Rolling Stones lyrics, and computer games.
   http://www.yxq98.ukgateway.net/

Pieter's Pi Memorizing Aids  
   Memorizing aids.
   http://web.inter.nl.net/hcc/J.Moree/pirecall.htm

A Tribute to Pi  
   Club and information.
   http://www.acc.umu.se/~olletg/pi/tribute.html

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.
   http://www.ac.wwu.edu/~mnaylor/pi.html

Dale's Pi Page  
   Includes history of Pi, songs and jokes, poems, news and the first 1,000,000 digits.
   http://www.geocities.com/SiliconValley/Pines/5945/

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.
   http://library.thinkquest.org/C0110195

The Friends of Pi Club  
   News, club, links, and information.
   http://www.astro.univie.ac.at/~wasi/PI/pi_club.html

One Billion Digits of Pi  
   Ramanujan, modular equations, and approximations.
   http://www.cecm.sfu.ca/organics/papers/borwein/index.html

How Stuff Works: Pi  
   Animated graphic helps to explain Pi and the different ways of calculating Pi, with some related links.
   http://www.howstuffworks.com/pi.htm

Pi Through the Ages  
   History.
   http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Pi_through_the_ages.html

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.
   http://briantaylor.com/Pi.htm

How pi?  
   Extracting the digits of pi from the SlOka
   http://www.geocities.com/ResearchTriangle/Facility/4118/misc/pi.html

A Common Book of Pi  
   Includes a brief history, a page with different formulas and a list of references.
   http://personal.bgsu.edu/~carother/pi/Pi1.html

The Constant Pi  
   History, formulae, algorithms, programs, records of computation, and references.
   http://numbers.computation.free.fr/Constants/Pi/pi.html

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.
   http://www.escape.com/~paulg53/math/pi.html

Greg's Page of Pi  
   Includes introduction to Pi, 3 pieces of Pi art and links.
   http://paperpen.com/greg/pi/

Earth Mysteries : Notes on Pi (¼ )  
   An introduction to the number Pi and its history.
   http://witcombe.sbc.edu/earthmysteries/EMPi.html

The Uselessness of Pi and its Irrational Friends  
   Clubs, links, memorizing technique, records, art, and programs.
   http://www.go2net.com/internet/useless/useless/pi.html

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 memoriz
   http://www.pi-world-ranking-list.com/

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.
   http://www.sciencenews.org/20010901/bob9.asp

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.
   http://www.nersc.gov/~dhbailey/pi-science.html

The Magic Piworld  
   Provides generated pictures and personal signs out of digits of Pi. Also a Picture Gallery, PiSign, PiPhonie.
   http://www.piworld.de/piworld/mpw_home.htm

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.
   http://www.earthmatrix.com/ancient/pi.htm

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.
   http://mathforum.org/dr.math/tocs/pi.middle.html

Lucy Scale Developments  
   Pitch, Pi, and other musical paradoxes.
   http://www.harmonics.com/lucy/ltindex.html

Archimedes' Constant  
   Information about the constant and some mathematical discussion of the effects.
   http://pauillac.inria.fr/algo/bsolve/constant/pi/pi.html

Calculating Pi  
   An open source endeavor for the calculation of this constant. Describes the project, the implemented algorithms for calculatinon and software downloads.
   http://projectpi.sourceforge.net/

The Pi Pages  
   Information on Pi, its history, its future, and the people involved in its calculations.
   http://www.cecm.sfu.ca/pi/

Elias' Pi Page  
   Includes Pi in the Binary number system, Pi as a sound file and Pi shown in different images.
   http://www.befria.nu/elias/pi/

Pi Patterns  
   Images and illustrations created by using the digits of the circle constant.
   http://www.antigravitypress.com/Math/pi/

Archimedes and the Computation of Pi  
   A page that contains links information on Archimedes and an interactive applet that illustrates how he estimated Pi.
   http://www.math.utah.edu/~alfeld/Archimedes/Archimedes.html

A New Approach to the Universal Constant "pi"  
   A text that tries to prove that pi is 3.1416 exactly.
   http://alkyone.com/mak-pi-gr/en/

Ask Dr. Math: About Pi  
   Explains what the constant is and a brief history. Includes resource links.
   http://mathforum.org/dr.math/faq/faq.pi.html

Fabrice Bellard's PI page  
   Showcases digit extraction and FFT multiplication algorithms.
   http://fabrice.bellard.free.fr/pi/

Pi Land  
   Fun activities, a Pi trivia game and a Trainer for digit memorization. Pi poetry, artwork, and photography, calculations, digits and book reviews.
   http://www.eveandersson.com/pi/

Indiana Pi Bill  
   Bill proposing new value of pi.
   http://tafkac.org/legal/indiana_pi_bill.html

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.
   http://www.lbl.gov/wonder/bailey.html

Land of Pi  
   Pi digits, random links, and some downloads.
   http://www.geocities.com/landofpi/

Pi 3.1416  
   Mathematics as the language of nature.
   http://www.freewebs.com/pi3point1416/

Fun With Pi  
   A Topica email list. Archives readable by anyone.
   http://lists.topica.com/lists/funwithpi@igc.topica.com/

Archimedes' Approximation of Pi  
   Describes the method introduced by Archimedes for aproximating Pi.
   http://itech.fgcu.edu/faculty/clindsey/mhf4404/archimedes/archimedes.html

The 1000 billionth binary digit of PI is '1' !  
   Announcement of the 1000 billionth digit of Pi.
   http://fabrice.bellard.free.fr/pi-challenge/

Buffon's Needle  
   An analysis of it's relation to Pi and a simulation by George Reese.
   http://www.mste.uiuc.edu/reese/buffon/buffon.html

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.
   http://pi314.at/math/normal.html

Pi Shop  
   Provides accessories with Pi-Prints on them. Shirts, mugs and bags.
   http://www.cafepress.com/piday314

Pi Approximation Day  
   22/7 - that is, July 22. For the past few years, people at Chalmers University have celebrated it.
   http://www.rebas.se/humor/piapprox.shtml