Today's MIX 2010 keynote focused on Internet Explorer 9.0, which is now available as a platform preview. IE9 adds native video playback (H.264) through HTML 5, hardware accelerated graphics using DirectX, has support for scalable vector graphics, and a new JavaScript Engine. The JS engine matches Firefox 3.7 alpha in performance - a marked improvement upon IE8. JavaScript performance does matter to Microsoft afterall.