Motion Portrait: Instant 3D animation from photos

''Motion Portrait is a killer little piece of digital animation technology that easily transforms an ordinary digital photograph of a face into a living 3D animation that can blink and move its eyes, turn its gaze to follow the movement of the mouse cursor, express a range of emotions, sneeze and more — all in a matter of seconds. In addition to being fast and easy to use, Motion Portrait is much lighter than conventional 3D animation engines, making it ideal for use in cellphones, handheld games and other portable devices.'' [source and demo and another demo]