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Really nice demo. But there's one semi-unrelated thing I noticed (disclaimer: yeah, I don't like Flash either, but): This demo, with a handful of animated bezier curves drove one CPU to 40% (using Chrome on a Mac). And this is something that I repeatedly encountered with graphics rendering done in Javascript. The whole "less flash"="less cpu-usage with animation"-thing might be a little premature.

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I find that simple SVG animations frequently push up the CPU, but Canvas can do much better. I wouldn't be surprised if this same demo used only 2-3% of your CPU in Canvas.

WebGL should deliver another order-of-magnitude speed increase, but I'm holding off for another 6 months or so for things to stabilize before diving into the 3d context.

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