HTML Basics

Guide to Creating a Website with HTML - http://www.34sp.com/hosting-library/guide-to-creating-a-website-with-html

HTML Primer - http://www.htmlprimer.com

Web Monkey - HTML Basics - http://www.webmonkey.com/2010/02/make_an_html_document/

Web Monkey - HTML Cheat Sheet - http://www.webmonkey.com/2010/02/html_cheatsheet/

The Bare Bones Guide to HTML - http://werbach.com/barebones/barebones.html

Web Teacher - HTML Guide - http://www.webteacher.org

Eight Minute Guide to HTML - http://drott.cis.drexel.edu/MinutesAll.html

HTMlite Tutorials - HTML Basics - http://www.htmlite.com/HTMintro.php

Dave's HTML Guide - http://davesite.com/webstation/html

Things NOT to do with HTML

Vincent Flanders - http://www.webpagesthatsuck.com/

HTML Validation

Doctor HTML - http://www.fixingyourwebsite.com/drhtml.html

HTML Validator - http://validator.w3.org

Design

Yale Web Style Guide - http://www.webstyleguide.com

Web Design/HTML - http://webdesign.about.com/