The budget on this game and the 44/56 split in HD consoles pretty much made it necessary...like most other huge 3rd party titles. These two consoles are tied at the hip for major 3rd party software due to economics.
PSN: TheGodofWine (Warhawk / R2 / MotorStorm PR)
AND
PSN: Skigazzi (for KZ2 and future games)