Web Sites for Web Builders

• A List Apart -- online magazine for people make websites.
• Alsacreations -- CSS tutorials with an international flavor.
• CSS Homepage at W3C -- information about Cascading Style Sheets from the horse's mouth.
• CSS Layout Techniques -- excellent resource for learning CSS layouts, with plenty of links to other CSS sites.
• HTMLdog -- bills itself as "a good practice guide to XHTML and CSS." Tons of info for all levels of designer.
• HTML Goodies -- covers a lot of other goodies, too, such as CSS, Javascript, and PHP.
• Introduction to XHTML -- a good place to start learning about XHTML.
• JavaScript Kit -- in addition to free scripts to download, this site also has tutorials on Javascript, CSS, a web building.
• PHP.net -- the place to go for authoritative, comprehensive, current information about the general purpose web scripting language called PHP.
• PHP Manual -- official PHP documentation is available here in a selection of languages.
• Validate your markup at W3C -- is your markup "strict," "transitional" or in trouble? Find out here.
• Web Developer's Virtual Library -- there are a lot of ads here, but also a lot of solid, free information on every aspect of web building.
• W3C Homepage -- the World Wide Web Consortium is the organization that developes specifications, guidelines and tools for the web.