does sony actually have any real 3rd party exclusive games? Agent is just a mystery that may be multiplatform(just like Quantum Theory was ps3 exclusive until recently) and Square Enix constantly talks about Versus 13 going multiplatform. besides that there's only annual Yakuza games and 2-3 weird ass jrpg games that are borderline hentai. and most of those we're still secured by Sony(moneyhatted)
xbox 360 have all 3rd party love if we're talking about HD platforms. Kalypso is making games exclusively to 360 same as 1C Company. City Interactive will make only 360 games if we're talking about consoles(they have 3 upcoming games for xbox besides Sniper: Ghost Warrior), Korean developers are also more willing to make games exclusive to 360 than to ps3 or even going multiplatform.
so as far as i'm concerned 3rd party ps3 exclusive are pretty much dead.