From June 30th until September 31st the PS2 averaged 240,000 units, the PS3 has averaged 200,000 units so far this year and has seen the release of the biggest multiplatform game of the generation and the PS3's biggest exclusive of the year. I think it is safe to assume that the PS3 will be outsold by 30,000 to 60,000 units per week (on average) and fall 400,000 to 800,000 additional units behind the PS2 by the end of September.