This great post by Hui Jing is ostensibly about CSS shapes and exclusions, but there’s a much broader message too:
Build demos, and play around with anything that seems remotely interesting. Even if that feature is in early stages, or only supported by 1 browser. And then talk about it, or write and tweet about your experience, your use cases, what you liked or disliked about it.
We can shape the web to what we want it to be, but only if we get involved.