“20 Things I Learned About Browsers and the Web” is a short guide for anyone who’s curious about the basics of browsers and the web." The illustrations are great and the implementation (using the canvas tag) is slick.
CSS3 PIE (Progressive Internet Explorer) is an IE behavior that extends it's capabilities by providing support for several CSS3 features such as border-radius, box-shadow, border-image, multiple background images and linear gradients for background images.
As noted on the site, this is "the professional badass's base HTML/CSS/JS template for a fast, robust and future-proof site" While I likely won't use this whole, there are some very interesting pieces to this worth using, especially in the style sheet and .htaccess files. I'll likely appropriate many of the concepts for my work.
This is an outstanding contribution to the Web development community by Paul Irish and Divya Manian as well as all of the people whose work they built upon.