I think due to Wii shortages, and an upcoming explosion in PS3 sales, the PS3 will either be close 2nd or slightly ahead of Wii this winter.
The Wii is more likely to be a mid year purchase. People who want to buy a PS3 would save it until the end of the year, because of pricing. With price cut, games, name, and features, those non-gamer types will pick up alot of PS3's IMO.