IE9 is really a new direction from MSFT, or maybe is it just from the IETeam. While most Microsoft fans will cheer the IE9's H/W acceleration and concentrate on FPS numbers, I see the new support of standards from Microsoft as the amazing thing. Well done.
Among other things, they dropped VML and their event handling API, in favour of SVG and W3 DOM events. [Don;t be alarmed, IE7's rendering engine is included inside for broken^H^H^H^H^H older sites] They put-in Canvas support, even if I never thought they'd do that in a million years due to competition with Silverlight.
Anyway, to me, as a tech-guy and an instructor, IE9 is irrelevant now. Why? One word: WebGL.
1) Google's answer to the fishtank demo: http://www.youtube.com/watch?v=9pM9LBcKxK4
2) http://www.iquilezles.org/apps/shadertoy/ Sorry, IE9 not supported WebGL Browsers only (FF4, Chrome, Safari, etc.)
Summery: Well done Microsoft, please don't stop here!