TeX Frequently Asked Questions - http://www.tex.ac.uk/cgi-bin/texfaq2html?introduction=yes Searchable version of the TeX FAQ list maintained by the UK TUG.
Help and Information Sources - http://www.ams.org/tex/additional-sources.html Help and Information Sources at AMS.
References for TeX and Friends - http://www.miwie.org/tex-refs/ An ongoing project with the aim of providing a help file for LaTeX and his friends like ConTeXt, Metapost and Metafont using a state-of-the-art source format, aka DocBook/XML.
Nwalsh.com: TeX - http://nwalsh.com/tex/ Online help for Plain TeX, LaTeX, BibTeX, MakeIndex and SliTeX. By Norman Walsh.
The Scientific Workplace Survival Guide - http://www.sba.muohio.edu/hinelidr/html/swpsg.htm Tricks and hints on how to use SWP and how to customize the appearance of documents.
TeX by Topic - http://www.eijkhout.net/tbt/ Free download of the out-of-print book written by Victor Eijkhout.
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