Vornado FA1-0007-06 Zippi Desk Fan
In another pick I described why the Vornado room fans are great. I recently purchased a Vornado desktop fan (the Zippi) and can now recommend it, too. It doesn't move air across the room, but aim it at yourself from just behind your keyboard and you'll feel a pleasant breeze all day long.
it's small and cool (literally)!