If you have downloaded and started using recently released RC version of Internet Explorer 9 and don't like the Tab bar and addressbar 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.

[attachment=0:1pxoif1l]IE9_RC_Menubar_Commandbar_Favorites_Status_Bar_Enable.png[/attachment:1pxoif1l]

2. That's it. It'll put Tab bar on a new row just below the address bar: