http://vgchartz.com/hwcomps.php?cons1=DS®1=Japan&cons2=PSP®2=Japan&cons3=DS®3=Japan&start=38662&end=39481
check out this graph, this tells the whole story... something happened for the PSP in September of 07, and since then it has seen the only success it has EVER seen there... While the PSP is trending down in NA and Others it seems to be actually improving in Japan.. Is it being used as a media device?
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut