it was my understanding that all ps3 games are region free but i don't know much about sony stuff
PS3 games have regions, it's just that they (usually) aren't locked. The only region locked game I know of is the region 1 version of the original Persona 4 Arena, which was region locked to stop Japanese PS3 owners from reverse importing it before the Japanese release.
I'm not sure on all of the regions, but Region 1 is North America, 2 is Europe/Australia, 3 is Japan, and Korea and Asia have their own region codes too. The PSP uses the same regions and also wasn't locked.
Here's some more infoAlso, PAL games won't play in SD on an NTSC PS3 and vice versa. But they play in HD on all PS3s.