Mr Doob does it again! Check out http://mrdoob.com/projects/chromeexperiments/depth_of_field/ to see an amazing 3D graphic demo, all done using Javascript. This means that there are no big fat graphics servers in the background, it’s all done and calculated and displayed within your browser. Responds to mouse movement too.
Sometimes seems to have problems displaying in IE7 so check it out using Firefox or Google Chrome.