Online Lectures

Duke Mathematics Department
University of Tokyo,Japan
BIRS Videos in Banff International Research Station, Canada
Clay Mathematics Institute, USA
Clay Mathematics Institute Summer School on
Floer Homology, Gauge Theory and Low Dimensional Topology
2004 Budapest, Hungary
Donaldson Mexico lectures, 2004
Duke University: Geometry and Theoretical Physics  
Institute for Theoretical Physics, UCSB, USA  
GRASP at the University of Texas Austin  
London Mathematical Society Durham Symposium:
Geometry, Conformal Field Theory and String Theory

MSRI, Berkeley, USA (click here for old one)  
Michigan State University, USA (click here for old one)  
Newton Institute, UK  
Pacific Institute for the Mathematical Sciences, Canada  
Southwestern Center Streaming Video  
Strings Conference 1998 2000 2001 2002 2003 2004 2005 2007 2008 2009  
The Fields Institute, Toronto, Canada  
Institute for Advanced Study, Princeton, USA  

Papers and Articles

Lecture notes by Nigel Hitchin  
Personal Page of Alexandre Stefanov
Hodge Conjecture by Daniel S. Freed  
Lecture Notes in Algebraic Geometry
Notes and commentary on Perelman's Ricci flow papers
Online Texts in Open Directory Project
Lecture Notes in Heidelberg
Online Mathematics Textbooks
Maths Archive
Samizdat Press
Front for the Mathematics ArXiv

Mathematics Organizations

American Mathematical Society e-Print archive
Electronic Geometry Models
Mathworld, Wolfram
MIT OpenCourseWare
Institute for the Physics and Mathematics of the Universe