What Every Developer Should Know About URLs
Alex Skorkin gives a developer-oriented overview of what is usually a mundane topic: URLs.

HTML5 and Same Markup: Second IE9 Platform Preview Available for Developers
The Internet Explorer team announces the second release of the IE9 Platform Preview. The emphasis is on speed in this release; the tool has also made some progress on Acid3 status. Get the update.

HTML5 For Web Designers
Jeffrey Zeldman announces the first new book for A Book Apart, titled HTML5 For Web Designers , written by Jeremy Keith. Additional commentary from Jason Santa Maria, Mandy Brown, and Jeremy Keith.

A Brief History of Markup
A free preview of the first chapter of HTML5 for Web Designers on A List Apart.

Pure CSS3 Spiderman Cartoon w/ jQuery and HTML5 – Look Ma, No Flash!
Shows how a Flash-less video can be created using HTML5, CSS3 animations and a bit of JavaScript. There’s even sound! For Webkit browsers only (Safari, Chrome). Watch the video. I’m incredulous!