Visual Studio hotkey to switch between code behind and source file?

F7

In the VS2010 the following works:

1. Go to: Tools > Options > Keyboard

2. Search for "View.ToggleDesigner" in "Show Commands Containing".

3. Add new shortcut to "Global" with F7.

Yep just F7

Look at this poster for C# VS2008 shortcuts

You can also bind it to any combination of keys you like, go to tools, options (show all settings) environment, keybord, Show Commands for View.ViewCode and change to your liking.

Added by Rob Cooper:

For 2005 Users: Visual C# 2005 Keyboard Shortcut Reference Poster

For 2010 Users: Visual C# 2010 Keyboard Shortcut Reference Poster

Edit 08 Sept 2014

There don't seem to be posters beyond 2010 but there is a website for VS2012, VS2013 and VS14: Visual Studio Shortcuts