Just going to ramble a bit here to justify the 3rd prediction in my sig, in case anyone cares:
Currently, the PS3 has sold 3.37 million consoles. Let's say that in the last 6 weeks of 2007 (holiday season), the PS3 manages to sell a good 1.5 million units (check TheSource's thread on December sales, he predicted 1.2 million units for December alone).
If we hypothetically assume Sony has sold 6.5 million units by the end of the year, that leaves us with 1.63 million units between now and the holiday period. The current sales numbers are until week 22 of 2007, which means 24 weeks until the holidays start. That gives us an average of ~68k PS3 sold per week in non-holiday period. The PS3 now stands at 43k per week. Can it really do 68k in its average week from here till the holidays? I don't think so.
Conclusion: I wouldn't be surprised if the PS3 stood between 6 and 6.5 million by the end of the year. But I would be very surprised if it did much more than 7 million...
My Mario Kart Wii friend code: 2707-1866-0957
