David

I believe it is up to the developer what formats the disc title will support. A game title could pass Sony certification in PAL regions without providing NTSC display modes. But it is also possible for them to support both display modes. So why wouldn't they support both? It could be that the game requires extra testing for both modes, and hence a larger chance of failing certification. A bigger argument on Previous Gen games (PS2, etc.) was that there may not be enough disc space to provide assets (movies, animation, etc.) for both NTSC, and PAL regions. That's not likely a good argument with Blu-ray however. But many European TV's (non HD) support both PAL and NTSC, so some European PS2 games supported both modes. So there is no reason the PS3 titles can't support both, it just may not be required for certification in Europe.

Two friends.