Proving that the Unreal Engine can go anywhere, Epic has released a version of its gorgeous interactive tech demo Epic Citadel which runs in HTML5.
A Flash version of Epic Citadel has been knocking around for a while, but the HTML5 version is far more exciting because it doesn't cause my browser to crash every few minutes.
Epic Games and Mozilla showcased the demo at GDC but have now made it accessible to all comers. You don't need any plug-ins to run it, even.
This is actually kind of incredible, you know; it opens the door to Unreal Engine 3 games played directly on the web. Epic would particularly like you to take note of the realistic reflections and animations, global illumination, and dynamic specular lighting with texture masks. Sure.
Just look at it. If you use Firefox, go ahead and try it for yourself.
Epic Citadel is also available on iOS and Android and presaged the release of Infinity Blade, one of the first games to show that smartphones could do lovely looking 3D games.