the winners: http://nobelprize.org/nobel_prizes/chemistry/laureates/2008/index.html
GFP is a molecule that comes from jellyfish. When excited with a certain wavelength of light, GFP fluoresces; it glows green. Since its discovery, it has been used to track the movement of your favorite protein inside the cell, in real life, using a fluorescent microscope. It has become the staple of microscopic visualization and is used nearly ubiquitously across research laboratories. In fact, I used it last week.
A cool page outlining the applications of GFP: http://userpages.umbc.edu/~jili/ench772/