http://www.w3.org/ -- The World Wide Web Consortium (W3C) develops specifications, guidelines, software, and tools for the Web. The primo resource for information and tutorials.
http://www.w3schools.com/ -- W3Schools has free web-building tutorials.
http://www.actden.com/fp/ -- Good resource for introducing FrontPage in the classroom.
http://www.angelfire.com/super/badwebs/ -- The World's Worst Website.
http://www.htmlcodetutorial.com/ -- HTML Code Tutorial.
http://javascript.internet.com/ -- The JavaScript Source.