well with the proper camera you just hold down the button and it takes a bunch of pictures real fast and you put them on top of eachother in photoshop. pretty sure that's the general idea of how it works, dont know anything more about it.
you hafta have a nice camera that has a high shutter speed. then you point, hold down the button, and later use photoshop to combine the photos you have taken into one,it takes a little getting used to.
shutter speed has nothing to do with it, although you need a pretty fast one just to freeze the action. you need a camera that will shoot a certain number of frames a second. im guessing the one on the front page is around 8 FPS