Here is a collection of very handy little toggle scripts to use as short cut.
They allow the user to show or hide in one click, viewport ellements like 
poly,curves, joints, locator, cam or timeslider, channel box, shelf...

To install them:

1. copy the scripts in your script folder .../maya/scripts.
2. restat maya.
3. run the command:
source NP_toggle_cam.mel

(It is an exemple, you have to do the same for each script. 
You can create a button or a shortcut with this command).
