Ben Ward: Understand the Web
What 'the web' actually is, and why building desktop-class applications on it is not what it was built for.
User First Web: Problems with Web Standards: Part II
"Given the coming battle for dominance over the mobile web and the size of the potential market (over half the world’s population), the most likely outcome is that we will see a return to proprietary extensions—a replay of the browser wars..."
Keryx (X)HTML Elements Best Practice Sheet
Detailed to the point of being almost unreadable!
Blueprint, A CSS Framework by Olav Bjørkøy
"Blueprint is a CSS framework, which aims to cut down on your CSS development time. It gives you a solid CSS foundation to build your project on top of, with an easy-to-use grid, sensible typography, and even a stylesheet for printing."
CSS3 Support in Today's Browsers
A table of who supports what.
Andy Budd: Blogography: CSS/Web Standards Links
A huge and valuable collection.
Eric's Archived Thoughts: Reset Reloaded
Resetting all default browser styles for a blank slate.