IBM's supercomputer "Watson" beat Jeopardy Champions Ken Jennings and Brad Rutter in a practice round today. Taping of a full show happens tomorrow, to be aired in mid February.
Reuters Article
The computer has 15 Terabytes of Ram, and 2880 Processor cores.
The supercomputer is not connected to the internet, it relies completely on information stored on it's drives.
Getting a computer to play Jeopardy is not as easy as it might sound.
Popular Science article.