I just wanted to announce that Facebook's React library, after a couple of months of learning (on-and-off) is one of the best projects to come out of the OSS community in a while. Adding to that, so is the community itself — so many great people.
While I'm at it, thanks to manc.js for letting me do a talk their last Wednesday!
Oh, and also — here's one of my first contributions to React. I called it React Layout.