I tried and really like Tabs Studio for Visual Studio 2010!

I have started using “Tabs Studio” for Visual Studio 2010 – an add-on that groups the different project files belonging together in a single tab with clickable extensions

Furthermore it displays to rows of tabs that are always fully visible instead of making me scroll left and right to find hidden tabs.

The look of the tabs is fully customizable and there are quite a few nice templates available for download.

Only drawback – In Visual Studio 2010 I lose the possibility to drag a single tab (code file) to a second screen.