The HTML HEAD Element
http://dev.opera.com/articles/view/13-the-html-head-element/

Heilmann, Christian
Opera
2008

Abstract:

This article deals with a part of the HTML document that does not get the attention it deserves: the markup that goes inside the head element. By the end of this tutorial you’ll have learnt about the different parts of this section and what they all do, including the doctype, title element, keywords and description (which are handled by meta elements).