‘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.

Demystifing Nth-Child in CSS - From NealGrosskopf.com

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

Powered by the WebKit engine, Safari offers leading performance, compatibility, and a great set of built-in web development tools.

"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.