Now this device is really simply, but really really handy -- especially for those of you who work in cubes or have their back facing the door.
The C.H.I.M.P. rearview mirror attaches to your computer monitor and just like a car's rearview mirror, you can see who's approaching. Don't let the boss sneak up on you -- alt-tab to make it look like you are doing work! It bubbles so you can see a wide range behind you.