Maths

The psfrag handout
addresses the common problem of how to add LaTeX maths to a postscript file.
Part of Math into LaTeX
(by G. Grätzer) is online
The Short Math Guide for LaTeX
comes from the American Mathematical Society
amsmath: "The amsmath package is an extension package for LaTeX that provides additional features to facilitate mathematical typesetting. It has been developed by the American Mathematical Society and released for general use as a service to the mathematical community.
The AMS-LaTeX User's Guide and
the AMS pageAMS-LaTeX provide introductions.
mathmode by Herbert Voß is useful, there are more related texts on his page.
Matlab
has some support for LaTeX production. Type "help latex" inside matlab for details.
Effective Scientific Electronic Publishing(by Markus G. Kuhn)
and AcroTeX by D.P.Story cover PDF production.
Maths cheat sheet
(Martin Jansche)