How to identify menus and commands in Visual Studio 2008

From Visual Studio 2005 SP1 on, there's an undocumented registry switch to enable debug messages which show the guid and id of a selected menu or command. To enable this hidden switch, you'll have to add a dword registry entry under [HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\9.0\General] which is called EnableVSIPLogging. It should have a value of 0x00000001 (hexadecimal 1).

After restarting Visual Studio 2008, you can now identify menus and commands by pressing STRG+SHIFT and clicking on the menu or command.

For instructions on enabling this for Visual Studio 2005, see this article.