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I get "Turbulenz is not currently supported on your platform, but we're working on it!" running Chrome under Ubuntu.
Sure, Linux gaming isn't a big market, but surely one of the big points of HTML/web gaming is cross-platform support?
I wish these guys luck - I actually interviewed there a while back, and the technical members really know their stuff - but I think they've got a few more barriers to cross first to get to 'it just works'.