RAINBOW SIX VEGAS 2: Tropic Thunder!
In what is surely one of the most clever in-game advertising gimmicks ever, Ubisoft has hidden a sweepstakes within R6V2!
Now, the screenshot given at the link above doesn't seem to do anything. I tried it, and got no response.
So i started playing the game itself- turns out Clue #1 is located on of the first levels in Vegas- you're out to rescue an undercover operative being tortured. When you pop out on the roof, as you hear him being mutilated, look around and you'll see a Tropic Thunder Billboard- which tells you to go to The Convention Center South Hall.
We'll see what we find there....