Getting Started with LaTeX written by David R. Wilkins.
The not so Short Introduction to LaTeX2e in your native language: written by Tobi Oetiker. From this document you will learn all you need to know about LaTeX. It will enable you to write your documents with this great tool. You will even learn what LaTeX is, in case you don't have a clue.
The root of the Comprehensive TeX Archive Network directory tree.
The TeX Users Group (TUG) Web site.