another draft W3C i18n tutorial: Using language information in XHTML, HTML and CSS
the W3C folks have released another i18n tutorial, this one deals with providing language information. it aims to cover these objectives:
-guidelines for declaring the language of documents and text
-how to specify language attribute values
-applicability of the language tag to apply language-specific CSS styling
-a brief introduction to the concept of server-based language negotiation
well worth the read.