HTML GOODIES - This site is great for beginners as it works from the ground up and focuses more on basic tags.
W3SCHOOLS - This site has the most comprehensive list of all tags and their uses. They also have their own sandbox HTML experimenting tool.
HTMLDOG - This site has a wide variety of resources, ranging from Tutorials to References. Definitely a great place to start coding!
WEB DESIGN ABOUT.COM - This site is probably one of the most reputable next to W3Schools, their tutorials are top notch.