Analytic

Riemann's Zeta function - Notes by Xavier Gourdon and Pascal Sebah.
http://numbers.computation.free.fr/Constants/Miscellaneous/zeta.html

Inexplicable Secrets of Creation - Zeta function site by Matthew Watkins.
http://www.secamlocal.ex.ac.uk/~mwatkins/isoc/

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

Some Zeta-related Functions - Recent studies on Zeta functions.
http://www.geocities.com/CapeCanaveral/Hangar/4577/elmelik.htm

Ten Trillion Zeta Zeros - A Math Games article by Ed Pegg junior on Xavier Gourdon's computations. <small>(October 18, 2004)</small>
http://www.maa.org/editorial/mathgames/mathgames_10_18_04.html

Critical Strip Explorer - Java applet developed by Raymond Manzoni for viewing zeta in the complex plane.
http://www.secamlocal.ex.ac.uk/~mwatkins/zeta/CSExplorer/CSExplorer.htm

Vinogradov's Three Primes Theorem - Lecture notes on the home page of Timothy Gowers (DVI format).
http://www.dpmms.cam.ac.uk/~wtg10/

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.secamlocal.ex.ac.uk/~mwatkins/zeta/directoryofzetafunctions.htm

The Mark of Zeta - A MathTrek article by Ivars Peterson. <small>(June 21, 1999)</small>
http://www.maa.org/mathland/mathtrek_6_21_99.html

Irrationality and Transcendence - Lecture notes (PS) by David Angell, NSW.
http://web.maths.unsw.edu.au/~angell/5535/

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/