The Xbox LIVE Ad Showdown Sweepstakes debuted on February 2, 2009, will come to an end on February 8, and will feature a single grand prize. “One Grand Prize available, a prize package consisting of the following items: a Panasonic 1080p Full-HD Plasma 58" panel (Approximate Retail Value (ARV), $3,600.00), a 5-disc DVD home theater system with speakers (ARV, $549.99); an Xbox 360 Elite Console (ARV, $399.99); a 12-month Xbox LIVE Gold subscription card (ARV, $49.95). The total Approximate Retail Value (ARV) of all prizes: $ 4,598.98.”

More info: Official website