Every month, Next-gen is doiing an interesting analyses of the market based on NPD numbers. 6 pages of studies for number's lover.

(..) From a mathematical point of view, these graphs are enticingly linear, enough so that one is tempted to make simple predictions based on them (..):
- By mid-year 2008, PlayStation 3 would be behind the Wii by about 6 million systems and the Xbox 360 would still be ahead of the Wii by 1 million systems.
- By the end of 2008, PlayStation 3 would be behind the Wii by around 7.9 million systems and the Xbox 360 would essentially be tied with the Wii.
Even if these figures are wrong – and the year-end figures are quite possibly poor – that's not a bad thing. If the same graph in a year shows the fortunes of the PlayStation 3 turning around or the Xbox 360 maintaining a stronger lead over the Wii, then it will be ample evidence that the market has shifted in an important way.