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IE-9
Microsoft latest browser is IE9 or internet exporer 9.
Windows 7 integration
IE 9 give same experience you get on windows.
Better UI
IE-9 allows you to bring a part of web part forward to focus. Similar capability was provided by silverlight earlier. It is called as Shine the website.
HTML 5 and new web standard support
IE 9 support new standards for HTML 5, CSS3 and many more. These stanard makes web developement wonderful.
Use of hardware
IE optimize the computer graphics. The experience is improved for watching pictures, videos
Pinning
Pinning is important feature for user. In IE 9 you can pin a website or webpage. You can just drag the the browser tab to taskbar to pin the page. You can use the pinned feature to launch the page from task bar.
Jump Lists
Use jump list to use the sites you have pinned. Great idea - if you can get your site pinned to user site.
Aero Snap
IE-9 allows user to resize tabs with Aero Snap. You can do this by draging the edge of screen.