The Indian TeX Users Group provides excellent resources.

• The UK TEX FAQ, maintained by Robin Fairbairns. Click for a PDF or access it through your browser.
• DANTE e.V. also provides a German FAQ about TEX and DANTE e.V.: here it is – DE-TEX-FAQ
• The newsgroup comp.text.tex
• The Not So Short Introduction to LaTEX2e (Tobias Oetiker, Hubert Partl, Irene Hyna and Elisabeth Schlegl): httpftp
• A Gentle Introduction to TEX (Michael Doob): httpftp
• A Simplified Introduction to LATEX (Harvey J. Greenberg): httpftp
• Using Imported Graphics in LATEX2e (Keith Reckdahl): httpftp
• The Great, Big List of Symbols (Scott Pakin, David Carlisle, Alexander Holt): httpftp
• Users Guide for the amsmath package (tex source): httpftp
• Higher Mathematics — This is an updated version of chapter 8 of the LATEX Companion (Michel Goossens, Frank Mittelbach, Alexander Samarin): httpftp
• Packages in the graphics bundle (David Carlisle): httpftp
• Documentation on LATEX2e in hypertext format: httpftp
• The LATEX2e sources (Johannes Braams, David Carlisle, Alan Jeffrey, Leslie Lamport, Frank Mittelbach, Chris Rowley, Rainer Schopf): http
• User manual for pdfTEX (Hàn Thê Thành, Sebastian Rahtz & Hans Hagen): screenprint
• ConTEXt: a general purpose & powerful TEX macro package (by Hans Hagen). ConTEXt home!
• Using TrueType fonts with TEX (LaTEX) and pdfTEX (pdfLATEX) by Damir Rakityansky
• A list of TEX resources on the web compiled for the TEX Users Group

LATEX2e distribution guides

• LATEX2e for authors (usrguide): http ftp
• LATEX2e for class and package writers (clsguide): http ftp
• Configuration options for LATEX2e (cfgguide): http ftp
• LATEX2e font selection (fntguide): http ftp
• Modifying LATEX (modguide): http ftp
• Cyrillic languages support in LATEX (cyrguide): http ftp
• The LATEX3 project (Frank Mittelbach, Chris Rowley): http ftp