The new Screencast Key Status Tool have 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.