If you're a developer you'll surely be excited about the amazing features we're using to make his game as good as it can be.
This site relies solely on HTML5 techniques instead of other ones which are currently being phased out, Flash for example. Instead, we use canvas for 2D rendering completely integrated into all modern browsers (Chrome, Firefox, Opera, IE).
Instead of using AJAX, which in comparison is quite slow, we use WebSockets. A features whose spec is currently under development but still implemented in most modern browsers (Chrome, Firefox, Opera).