The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards.
The W3C Markup Validation Service
W3C's easy-to-use markup validation service, based on SGML and XML parsers.
W3Counter - Free Realtime Web Analytics - Web Stats Counter
Free realtime web stats and hit counter for websites and blogs. Live analytics, visitor maps and click overlays.
css Zen Garden: The Beauty in CSS Design
A demonstration of what can be accomplished visually through CSS-based design.