The Riemann Hypothesis - A prime pages article by Chris K. Caldwell. - http://primes.utm.edu/notes/rh.html
Louis de Branges de Bourcia - Purdue University. Proposed solution for the Riemann Hypothesis (pdf format). - http://www.math.purdue.edu/~branges/
Proof of Riemann's Hypothesis - A claimed proof of Riemann's Hypothesis. - http://www.coolissues.com/mathematics/Riemann/riemann.htm
Easy Proof of Riemann's Hypothesis - Generalisations of the zeta function might provide a proof of Riemann's hypothesis. - http://www.coolissues.com/mathematics/Zeta/zeta.htm
Zetagrid - Numerical verification of the Riemann Hypothesis by a collaborative computing effort, with downloadable software. - http://www.zetagrid.net/
Riemann Hypothesis - Article with links to other resources from MathWorld. - http://mathworld.wolfram.com/RiemannHypothesis.html
The Music of the Primes - A popular article by Marcus du Sautoy on the Riemann Hypothesis; Science Spectra, Issue 11. - http://www.dpmms.cam.ac.uk/~dusautoy/2soft/music.htm