Ten Trillion Zeta Zeros - A Math Games article by Ed Pegg junior on Xavier Gourdon's computations. - http://www.maa.org/editorial/mathgames/mathgames_10_18_04.html
Directory of All Known Zeta Functions - A directory of websites maintained by Matthew Watkins on the topic of The Riemann Hypothesis and Zeta Function. - http://www.maths.ex.ac.uk/~mwatkins/zeta/directoryofzetafunctions.htm
X-Ray of Riemann's Zeta Function - Graphic visualisation of zeta by Juan Arias de Reyna Martínez, University of Seville. - http://www.pdipas.us.es/a/arias/Publications.html
Zeta Values on the Web - A bibliography compiled by Wadim Zudilin on values of the zeta function with links to those papers available on-line. - http://wain.mi.ras.ru/zw/
The Mark of Zeta - A MathTrek article by Ivars Peterson. - http://www.maa.org/mathland/mathtrek_6_21_99.html
Critical Strip Explorer - Java applet developed by Raymond Manzoni for viewing zeta in the complex plane. - http://www.maths.ex.ac.uk/~mwatkins/zeta/CSExplorer/CSExplorer.htm
A Prime Case of Chaos - Article from Volume 4 of What's Happening in the Mathematical Sciences by Barry Cipra, describing conjectural links between the Riemann zeta function and chaotic quantum-mechanical systems. - http://www.ams.org/new-in-math/cover/prime-chaos.html
Vinogradov's Three Primes Theorem - Lecture notes on the home page of Timothy Gowers (DVI format). - http://www.dpmms.cam.ac.uk/~wtg10/
Riemann's Paper - "Ueber die Anzahl der Primzahlen unter einer gegebenen Grösse" and in translation. - http://www.maths.tcd.ie/pub/HistMath/People/Riemann/Zeta/
Analytic Number Theory - Lecture Notes by Noam Elkies, Harvard, 1998. - http://www.math.harvard.edu/~elkies/M259.98/index.html