If your desk is like mine, completely cluttered with no room for that super giganto power mouse or you simply get wrist pains moving that big sluggish rat around, you might consider getting an LG Finger mouse. About the width of a standard lighter, the Finger mouse is a portable optical mouse with a top button that functions as the left-click and a rear button that functions as the right-click. The scroll wheel is situated nicely on the right. Exact price and time of release is uncertain for now.
LG Finger Mouse [Via Ministry of Tech]