List of resources on LaTeX, the old software system for document preparation.

Official website of The LaTeX Project. Links to latest news and releases, information on the product, documentation, tutorials, etc.
An easy to use online collaborative tool to work on (and share) LaTeX documents. They also have an excellent documentation.
An excellent source of information on how to use LaTeX.
A good introduction to LaTeX for beginners in PDF format.
A nice collection of free LaTeX templates.