The PSP resurgence has a few major steps in it:
http://vgchartz.com/hwcomps.php?cons1=PSP®1=Japan&cons2=PSP®2=Japan&cons3=PSP®3=Japan&start=39110&end=39628
MHP2 (98k/wk)
FF:CC (100k/wk)
PSP Slim (276k/wk)
MHP2G (137k/wk)
Each was represented with a spike, while the PSP Slim recieved the lion's share with 270,000 when it actually shipped en-masse. Since Slim, the PSP's sales have never, ever been the same in Japan. It wasn't FF that was the catalyst, as FF:CC managed just 120k copies second week while the 270k+ PSP Slims sold.
What the PSP slim has done in the past 9 months is beyond amazement. It's gone from irrelevancy and no use, to effectively handing the DS it's rear end in terms of HW sales.
Of course, this doesn't have much to say about PSP software sales, they're abysmal. But at any rate, going from 30k/wk to 70k/wk on average is huge in such an important region.
Back from the dead, I'm afraid.
