WebGL is pretty exciting offering browser based OpenGL and hardware rendered graphics. When this becomes mainstream this will change up gaming and interactive on the web immensely. Unity 3D and Flash 3d engines add lots of immersive environments and WebGL will be just as exciting, if all browsers adopt it (canvas/webgl).
WebGL brings plugin-free 3D to the web, implemented right into the browser. Major browser vendors Apple (Safari), Google (Chrome), Mozilla (Firefox), and Opera (Opera) are members of the WebGL Working Group. “It feels like, someone’s missin-ing”