HTML Tutorial from W3Schools.
HTML Tutorial:
Another tutorial for HTML.
Examples from CSC 105: Some of these focus on scripting, but there are also basic HTML examples.
HTML Doctor : This can verify the correctness of
your web pages and help maintain them
HTML Tidy : Another HTML verification tool.
Barebones HTML reference: A good
"quick reference"
Another Quick Reference
Dynamic
HTML tutorial
Collection of additional HTML links & resources