Microsoft released its long awaiting Internet Explorer 9 today. Definitely it is big improvement over its previous versions. It is available to download for Vista, Windows 7 and Windows 2008/2008-R2 series operating systems. Microsoft is dropped support for Windows XP even though it has significant market share.
The IE 9 has Chakra — a faster Javascript engine, HTML5 support, a faster rendering engine that uses GPU hardware acceleration for graphics and text, and it has sleek and clean user interface, pinned sites, jump lists, new tab page shows recently visited sites, tear-off tabs and windows aero snap and it has 2nd row tabs too.
Internet Explorer 9 provides built-in developer tools which helps developers in rapid prototyping, testing, and debugging webpages by allow to changes to code from within the browser itself. IE 9 has a user-agent switching tool, a network traffic inspector, an improved JavaScript profiler.
But when regarding html5 features it has to improve a lot of features. I got only 130 out of 400 points when I pointed the browser to html5test.com while current stable chrome(v. 10) is giving 288 out of 400.
Download the IE at Microsoft