Check out the Internet Explorer 9 Technical review. IE 9 will be able to take full advantage of CSS 3, HTML 5, and background compiled JavaScript. I warn you now do not install on your production workstation or computer, do this in a Virtual Machine or a workstation that you use for testing.
The Platform Preview is an early look at the Internet Explorer 9 platform so some features are incomplete, some may change, and some may be added. Read the full release notes here… http://ie.microsoft.com/testdrive/info/ReleaseNotes/Default.html