‘Look up HTML5, CSS3, etc features, know if they are ready for use, and if so find out how you should use them – with polyfills, fallbacks or as they are.’

Awesome.

“Lifted corners, Curled corners, Perspective, Raised box, Single vertical curve, Vertical curves, Single horizontal curve, Horizontal curves, Rotated box”

"Create Your Own @font-face Kits."

"Compatibility tables for features in HTML5, CSS3, SVG and other upcoming web technologies."

How to make an background image scale without using a ton of JavaScript.

Using CSS to detect device size (for things like iPads and iPhones).

Finally, a tutorial for getting size and line height to render and scale exactly the same in all browsers for a given font size. Requires some basic math in the stylesheet.