http://www.htmlgoodies.com

http://www.w3schools.com/html/

http://www.htmlcodetutorial.com

http://www.lissaexplains.com

http://www.echoecho.com/html.htm

http://www.webreference.com/html/tutorials/

http://www.jmarshall.com/easy/html/

http://www.arachnoid.com/lutusp/html_tutor.html

http://www.webcom.com/html/tutor/

If you know of any others that need to be added to the list, leave the URL in the comments.