2 - The reason games might be difficult to port from PS3 to 360 is most likely not due to hardware differences but to software differences (I can't confirm that they are, as I have yet to hear of ANY game studio that develops for PS3 first, then ports to 360. Tekken 6 may be the first example of such a game. And no, Virtua Fighter 5 does not count, it used the Sega Lindbergh system).
The PS3 is extremely difficult to program for. This is why most companies develop for 360 first, because they can get the core game done faster. Then they can just port the system specific items. Overall a huge cost saving maneuver.
i'm not really tech savvy, so a lot of the lingo is very foreign to me. But to help you with some examples of what games were developed on ps3, I believe, Burnout paradise was developed on the ps3 and then ported to the 360. not sure about armored core, or Dynasty warriors 6 or 7000 i forget. or other japanese games to be certain. I also know Final Fantasy 13 will be finished on the ps3 first, even thought that's the white engine and not a ps3 . and id's Rage will benefit on the ps3 because of bigger disc space. and Unreal 3 was developed on ps3 first. Not sure about Mirror's Edge either.
not arguing to be sure, just helping out with games that hit the ps3 first or was developed on the ps3 as a primary system. take from that what you will.
One thing i do notice though, is that when a Japanese studio develops a multiplat title, the differences between the two consoles tend to be slighter, and not as significant as when a Western studio develops multiplatform titles. i mean honestly.. fallout 3 was a horrible port then compare that to DMC4 which is a rather decent port. Orange box also, a horrible port. I don't know.. but I do know that if you do take the time to make a multiplat title. then take the time to make it right. developers need to bring it over properly so that it doesn't look like a sloppy second. I can only excuse the programming difficulty for so long, especially if there are other studios bringing more decent ports to the console, and if you keep saying it's difficult, while understandable, doesn't absolve them of fucking up a good game. if it means holding the game back, then do it. continue the polishing on the finished game, and work on getting the other console to that proper level. japanese people are doing it, might as well do it with the western studios as well. may hold the games you're looking forward to back but at least you'll know you will be getting quality.
and though I'm still a little miffed that tekken 6 and final fantasy 13 went multiplatform, i understand the reasoning behind it. but I can't find myself agreeing with it. it devalued my purchase choice. and the thought of me losing the bang for my buck, irks me. but that's something else. neither here nor there.
and I'm still waiting on a tales game for the ps3.