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List of all contributors to the website
Contributor
Nationality
Nature of contribution
Brent Abrahams

Corrected an attribution of a quote; we had Gauss giving praise to Euler when it was LaPlace instead, which lead us to explore the idea that Archimedes, Newton and Gauss should stand alone among the great mathematicians, an idea which we do not subscribe to.
Moa Apagodu
Corrected an error we had in an explanation of the problems that arise using Gosper's Algorithm.
George Barker

Corrected an error in the page dealing with the number of hands of poker.
Bo Brinkman

Communicated the lovely Identity #3500009, which we haven't found in the literature yet, so he may be the discoverer. (Knock on wood.) Bo also sent us a .pdf file with an easy to follow proof of this identity.
Jonathan Burns

Corrected a sign error in Identity #3900015. Excellent!
Vesselin Dimitrov
Sent in both a factorization identity from Granville and several of his own.
Mark Eggensperger

Suggested the inclusion of the pattern for turning a row of Pascal's Triangle into a power of 11.
Bill Everett

Author of the paper about binomial coefficients divisible by a fixed power of a prime.
Ira Gessel
Corrected an error in the statement of Sperner's Theorem we had on the identities page.
Martin P. Getz

Corrected an error in Identity #3100011.  Our first contributor from Alaska, to the best of my knowledge.
Nina Horne

Suggested a clarification of an unclear point in the page on the uses of the binomial coefficients.
Gottfried Helms

Communicated Identity #3500013, the natural log of the Pascal's Triangle matrix, Identity #3900054, another matrix identity connecting the binomial coefficients to the Delannoy numbers and Identity #390056, where ex is given in a formula using binomial coefficients, factorials and power series.  He also has given us links to several of his papers online.
Sean A. Irvine

Corrected an error in Identity #3700004.  Good on ya, Kiwis!
Dan Jurca
Communicated Identity #5100007.
Dan Kalman
Communicated the matrix identity #3900049.
Pieter H. van der Kamp

Comunicated identities #2100003 and #2100004 and their hints, as well as identity #3610011.
Isaiah Lankham
Sent in several identities, most notably in the Factorization category.
John L. Leonard

Sent in two identities, #3700012 and #3700013, which are derived in the paper "A Binomial Identity, via Derangements" by Chao, DesJarlais and Leonard.
Kevin Marinelli

Helped us with the moving of the website to another server when our original server left campus.  Thanks, Kevin!
Andrés Masegosa

Sent in the identity #3100017, a generalization of Vandemonde's Convolution he independently rediscovered.  (Independently rediscovering (relatively) well-known things is also a hobby of mine.)
Russ Merris
Told me that the name Christmas Stocking Theorem, which I thought was common, was actually coined by our mutual friend, the late Ken Rebman.
Chris Morgan

Suggested including the information about B-splines and the binomial coefficients.
Augustine Munagi

Corrected an error we had in Identity #3500004.  Very keen observation.
Yogy Namara
Indonesia
Corrected an error we had in Identity #1300002.  Those darn plus and minus signs!
Ron Ozer

Communicated Identity #1300004.
Angel Plaza

Communcated and proved Identity #3700015, and extension of Identity #3500009, provided by Bo Brinkman.  ¡Gracias, Angel!
Steven Poon

Communicated Identity #3700014.
Sebastián Martín Ruiz

Corrected an error in Identity #3900005 and communicated Identities #3610008, #5100013, #3900053 and #2200004.  ¡Gracias, Sebastián!  Also gave me the cool if inaccurate nickname "Todos Binomios".
Daniel Soll

Communicated Identity #3400002, based on the coefficients from the Lucas polynomials; we have not found elsewhere in the literature, and so he may be the discoverer.  As with Bo Brinkman above, we hope for the best.
Stuart P. Smith

Communicated several identities from the Gradshteyn and Ryzhik book.
Jodi Soares
She drew our cool logo, based on vague suggestions from the author of the page.
Zhi-Wei Sun

Added identities #3700007 and #3700008.
Richard Uhler

Helped us with the moving of the website to another server when our original server left campus.  Thanks, Rich!
Rick West
Rick showed a nice proof of Identity #2200002 in a class at UC Davis.