Late sending this today as I've had one of those days where nothing went to plan, and I'm writing late in the evening with one ear on SmashingConf Austin online. I'll be speaking tomorrow about new things in CSS. Some nice techniques in the articles I'm sharing today however, so I hope you find something interesting among them.
Also in the last week, Smashing pre-launched the book Typescript in 50 Lessons. I edited the book, and while it's not CSS I imagine there is some crossover of readers here and folk who want to learn Typescript. It's a friendly introduction to the subject, if it is something you would like to learn.