Robin Good: Smart Dot is an "appcessory" for your iPhone which plugs in your headphone jack.
Smart Dot works as a laser pointer, remote mouse and trackpad controller making it an excellent tool for presenters.
"By combining a laser pointer and Smart Phone, ‘Smart Dot’ is an exciting new product that allows the use of both a physical and virtual laser pointer simultaneously."
In fact, by downloading the free ‘Smart Dot App’ for iOS and Android OS, the actual laser pointer and a virtual mouse pointer on the screen can be shown at the same time.
When not attached to your iPhone the Smart Dot laser pointer can be inserted into the supplied stylus for safe keeping between presentations, and it can provide a useful tool for drawing or writing on your iOS devices.
For more info: http://tangram.kr/smartdot_eng/