Don’t bound your CSS directly to the HTML structure (it’ll result in more flexible development with less refactoring).
Keep an eye on a new (and shiny) home for different HTML (and CSS, of course) projects Adobe is working on. This will (most likely) become a quite valuable resource.
This is an article you should not miss if you care at least a little bit about performance – and you definitely should care about it.
Sass (or LESS) can really help you optimize your stylesheets (in areas of maintainability and performance).
We’ll all be (most likely) using these units very soon; this means it’s time to start learning about them.
Never (ever) let browsers fake the weights of web fonts, because results are pretty bad.
A quite awesome experiment that will teach you a 3d trick or two.
Until next week