Designing with Web Standards by Jeffrey Zeldman
Web Standards - The Web Standards Project is a grassroots coalition fighting for standards that ensure simple, affordable access to web technologies for all.
World Wide Web Consortium - W3C's nearly 400 member organizations lead the World Wide Web to its full potential.
A List Apart - A List Apart Magazine, for people who make websites. Web design, content, and coding. Accessibility, CSS, XHTML, scripting, server side, front and back end. Designing with web standards.
Zeldman - CSS, XHTML, front end design. Jeffrey Zeldman Presents The Daily Report: web design news and information since 1995.