Yep, newest version of chrome does work. Which is also the only browser that does. It uses about 40% of a i5 dual core cpu in the Macbook Pro 15" mid 2010.
I'm on a relatively ancient non-unibody MBP with a Penryn Core 2 Duo, 512 MB GeForce 8600M GT and Snow Leopard and it works on vanilla Chrome for me as well. And it uses 30%–40% here too — interesting since the i5 benches a lot better.
Doesn't seem to work here however on the Dev branch (15.0.849.0). Not that that's surprising: random stuff breaks regularly, and there's no way to go back...
It's probably more of a driver thing than a browser thing.
The demo works great on FF8 over here. Linux/NVidia.
Got the latest stable for ubuntu 32 bit and it doesn't work.
Not all combinations of hardware and drivers work yet. See: