I wrote a paper for my HCI class (that's Human Computer Interaction ;) about how blender needed something like this since I can never remember the more obscure shortcuts. It's nice to see that Blender is moving toward a more user-friendly interface, what with the widget thingies in the new version and now this. It's a great program, but there are so many people who never discover what it can do because they try it and then don't use it because the interface confuses them.