The final, consumer-ready Internet Explorer 9 is available for download starting at 9:00 PM PDT at www.BeautyOfTheWeb.com in 39 languages. With this set of browser releases, the best experience of the Web is on Windows. IE9 shows how your Web experience and browser are only as good as the operating system they run on:
Fast. With IE9, the Web delivers a new level of performance by unlocking the power of the PC hardware through Windows.
Clean. With IE9, consumers can keep sites at the center of their browsing experience, pinning them to the taskbar and interacting with them the same way they do applications.
Trusted. IE9 offers industry-leading protections (like SmartScreen) for the real-world threats (such as malicious sites and phishing scams) that consumers face every day on a sometimes-hostile Web.
Interoperable. With hardware-accelerated HTML5, developers can use the same markup across browsers to deliver a new class of Web experiences that feel more like apps than sites.
more at IE team blog - source: http://blogs.msdn.com/b/ie/