In Visual Studio 2010, there was a Create GUID entry in the Tools menu. I used it all the time for SharePoint Development.
Has Tools > Create GUID been removed in Visua
If you have Resharper installed you can just type nguid
and hit Tab inside Visual Studio. You can even choose format you want.
No it's there... at least it's available in Visual Studio 2012 Ultimate.
If missing try adding it via Tools -> External Tools and add:
%Installation Path%\Microsoft Visual Studio 11.0\Common7\Tools\guidgen.exe
EDIT: It's probably installed with Visual C++.