The already successfull Kickstarter project Stonehearth (and not Hearthstone the blizzard's CCG) will also use web technology (HTML, CSS and javascript) for the UI. They use chromium embedded instead of webkit but the principle is the same. You can have details here.
chromium is webkit Coherent UI that we use is another implementation of the same concept as chromium embedded.
Brilliant, thanks for sharing! Dropped $50 on Stonehearth (couldn't afford more, sadly). Web technology is good for a number of things. I just wish HTML5 web/content writers were better at HTML5 in general (much like how early website designers made, well, terrible non-XHTML-compliant websites back in the day).