Canon lens image stabilization is becoming fairly standard, even on some kit lens offerings. IS (VR for you Nikonians) allows shooters to use shutter speeds two to three (or four) stops slower with getting blurry images from shaky hands. Despite what a former colleague tried to vehemently explain to me: No, IS will not stop the motion blur from people moving in your images.
How does it work? Magical fairies and leprechauns inside your lens? Nothing so interesting. Take a look at this video from Camera Technica – a look inside a Canon 18-55 IS kits lens. When you’re done jump on over to Camera Technica and read the post on the Science of Image Stabilization Technology.