Microsoft Internet Explorer 9 beta has been released on the 15th of September in 2011 which was yeterday. The new version of IE is so much better than the others.
There is not so much to tell here. So it is better to try it by yourself. The Internet Explorer 9 Beta could be downloaded from below link;
http://windows.microsoft.com/en-US/internet-explorer/download/ie-9/worldwide
Enjoy your browsing :)