LaTeX - Document Classes

Some links to help with document classes in LaTeX:

http://en.wikibooks.org/wiki/LaTeX/Basics

http://texblog.org/2007/07/09/documentclassbook-report-article-or-letter/

http://tex.stackexchange.com/questions/4221/what-are-your-favorite-document-classes-and-what-do-you-use-them-for

http://tex.stackexchange.com/questions/782/what-are-the-available-documentclass-types-and-their-uses