if you want to compare it to xbox360 sales you will only find out that PS3 is selling at a far quicker rate than the xbox360.
the big thing is though is it selling more than the original PSX, because if it is (and i think it may be) then you can GO AWAY!! The PS3 is doing just fine.
it's the future of handheld
PS VITA = LIFE
The official Vita thread http://gamrconnect.vgchartz.com/thread.php?id=130023&page=1