Personally, I’m a Sass fan, but LESS is just as useful and probably a bit more popular. If you’re into it, you should definitely check out this extensive series on Developer Drive.
Modular approach and style guides will (if they haven’t already) become the most important building blocks of CSS. So, start learning about OOCSS, especially if you’re not building only trivial web pages.
CSS3 filters are absolutely awesome (but you already know this, don’t you?). And animating CSS3 image filters is probably the only thing more awesome than CSS3 filters themselves.
Element Finder searches through your project for any given CSS selector and provides a list of the files which contain elements matching that selector. Only downside is that you need Node.js to run it. But still, it’s probably worth the hassle.
If you (still) aren’t familiar with CSS pointer-events, this will be a lifesaver for you.
The most famous robot ever animated recreated in pure CSS3. This is so freakishly cool that you just have to see it.
Until next week