The biggest difference between the 360 and the PS3 is the format, and it makes a huge difference. The blu ray is able to play cd's dvd and all that stuff while the hd-dvd of ms isn't able to play blu-ray. The format is going to be one of the biggest isseus in this war. Let's not forget that both Sony and Ms have both made it very clear that the nextgen consoles are more then just gaming devices and the formats will make the difference.
Having the bluray not as an addon is a huge plus in Sony's favor as standard equipped hardware will be accepted faster then optional hardware. You can't be boned (?) by having the blu ray, you're more likely to be boned (?) when you settle for just an pimped dvd player
