Switch is an Addin for Visual Studio 2008, Visual Studio 2010 and Visual Studio 2012 that allows you to switch between C++ source and header files, WinForms code and designer, XAML and codebehind and more. With one button press, or keyboard shortcut, you can easily flick between related files.
For the developers amongst you, there is an article on the CodeProject that describes how to create this addin: Switch on the Code Project.
You can find out how to configure Switch at: http://www.dwmkerr.com/switch/.
New in Version 2.0
In Version 2.0 of Switch, the 'Switch' command is automatically created at the right of the main menu. As well as this, you can also configure your own switch extensions, just go to Tools > Options and then choose 'Switch':
Creating a Keyboard Shortcut for Switch
To set a keyboard shortcut for the Switch command, follow these steps: