Really cool tilt/shift movie courtesy of Boing Boing. Truly an amazing effect which shortens the focal range giving the effect of miniature life. Here's the wikipedia page on tilt shift miniature faking.
Some photographers have popularized the use of tilt for selective focus in applications such as portrait photography. The selective focus that can be achieved by tilting the plane of focus is often compelling because the effect is different from that to which many viewers have become accustomed. Walter Iooss Jr. of Sports Illustrated, Vincent Laforet, Ben Thomas, and many other photographers have images using this technique on their web sites.