Using Blender 3D screencast keys addon.

The new Screencast Key Status Tool has been added to this new release 2.60.

You can find it in part of the Blender AddOn Distribution.

Just go to User Preferences -> Add-Ons section.

Please see the picture below:

Press now the N key and this will activate in the tab View3D -> Properties panel -> Screencast Keys.

Press now the Start Display button and you see this in action.

The keys that are pressed to show up in the 3d viewport.