Working with a colleague? Doing a screen share? Have Visual Studio running on a projector? Get an error message that contains a line number? All these situations make your life tough if you have to watch the status bar to check your line numbers. This video shows you how to display the line numbers on the screen.
Tools | Options >> Text Editor | All Languages | General, and Check Line numbers
http://scottcate.looplogic.com/vstricks026
