I think the reason is that the PS3 uses blu ray and it will take a bit of time for game developers to get used to it. Plus the PS3 was released after the 360. The 360 used DVD ROM which is a cheaper format which is been out for years which game developers have been used to.I'm sure in a years time there will be just as much games out on the PS3 than the 360. I just hope the PS3 games can catch up to the 360's! But if blu ray loses the format war, then they won't catch up