I say Brazil, all the way.

Good question. After seeing how the two teams have played so far in this tournament (Argentina has been fantastic, while Brazil has been mediocre), one could easily predict Argentina by 2 or 3 goals, but you never know in games like this. These two sides have such a long history and dislike for each other and they always tend to play up to the occassion, regardless of recent form. Still, I can't see Argentina losing this one. I'm predicting Argentina wins 2-1, with Manchester United bound Tevez scoring the winner.