Please note, IE9 Platform Preview is not a beta release of IE9. The Platform Preview of Internet Explorer 9 will run only in Windows 7, Windows Vista Service Pack 2 (SP2) and Windows Server R2. Microsoft has worked hard and is working hard to bring some new web technologies and standards in Internet Explorer.
Whats new in IE9??
- IE9 will support HTML 5 web standard.
- CSS 3 support
- IE9 will provide hardware acceleration for rendering graphics and text on web pages.
And Many more… So, go ahead and have a test drive.
You can read more about IE9 and platform preview program here