Microsoft recently released RC version of Internet Explorer 9 .It comes with many interesting features and new User Interface.If you don’t like the Tab bar and address bar on same row, you can put the Tab bar on a separate row using following simple steps:
1. Right-click on Tab bar (empty area near Tabs) and enable "Show tabs on a separate row" option.
2. That’s it. It’ll put Tab bar on a new row just below the address bar: