Wii games generally have much longer legs, in part because of how much higher weekly sales are ... If you make the assumption that 3 months after the release of a game like Madden the same percentage of new console owners (regardless of the console) will be looking for a copy of the game, then the system with the highest sales will (obviously) see higher sales of the game.
It really doesn't surprise me to see the Wii versions of Madden Sales catch up to the PS3 version, and I wouldn't be surprised to see the Wii version of Madden 09 to (over time) approach the XBox 360's version ..







