Front for the ArXiv - Mathematical Physics  
   The UC Davis front end for the arXiv maintained at Los Alamos.
   http://front.math.ucdavis.edu/math.MP

Greenwood Research Books and Software  
   On-line catalog of books and software in mathematical physics, astrophysics, field physics, and engineering physics, including free astrophysics software downloads.
   http://grnwd.tripod.com/

Local Quantum Physics  
   Preprint archive with papers in PostScript format.
   http://www.lqp.uni-goettingen.de/lqp/papers/

Mathematical Physics Archive  
   An archive of papers published in the field of mathematical physics.
   http://rene.ma.utexas.edu/mp_arc/

Which Mathematical Structure is Isomorphic to our Universe?  
   Max Tegmark. Some physical consequences of ``the ultimate ensemble theory'', where not only worlds corresponding to say different sets of initial data or different physical constants are considered equally real, but also worlds ruled by altogether dif
   http://www.hep.upenn.edu/~max/toe.html

Recent Books on Symmetries and Integrability  
   List of recent books (since 1999) with links to publishers' pages.
   http://www.imath.kiev.ua/~appmath/books-links.html