game-editor.com

screen ruler rules! I use it all the time for HTML and Flash projects.
http://www.spadixbd.com/freetools/jruler.htm

This would be a helpfull little tool to have in GE. It could snap to the center point of actors and tell you the x,y distance between them as well as the angle.

I would like it to be a feature to be turned off or on in the UI

Of course, this would crucially make life easier sometimes while in game creation progress