This HTML QuikReference provides basic information on each tag, its attributes, and the values they can take. Each entry includes an example and the source code for the sample. The tags are arranged according to category. You can also search for a tag alphabetically in the tag index.
People very failiar with HTML might want to use Overture, which simply outlines each tag--name, attributes, and values. Each tag is linked to its full entry for more information. The Overture is also arranged by catagory; however, there is an alphabetical index to that, too.
The appendix provides additional references, such as character escape codes, as well as links to other sites. Reference links will take you to web resource sites. The banner links and text links (versions of the same thing) will take you to... other sites.