- The 251 LaTeX wiki page. Thanks, guys!
- The Wikibook on LaTeX
- A (Not So) Short Introduction To LaTeX2e
- The Comprehensive TeX Archive Network (users group)
- The TeXLive Homepage
Here are some links to various LaTeX editing programs. One of the easiest ways to edit LaTeX, though, is to create and edit the .tex source file with emacs, vim, or your favorite text editor, and compile it with pdflatex on the command line.