Valve on HL2 differences between the 360 and PS3

[Dolla Dolla]

"We can tell you that in terms of the whole game together on the PS3, we are not even using the SPU's and it is purely built on the graphics card and Cell."

I guess that explains why it isn't being released alongside the PC/360 version, because they haven't even begun to optimize the game to run on the SPU's. Well, at least we know the reason for the PS3 delay.