Yeah, I hear you about that. It sucked back in the PS2/Xbox days but I think I got alot of my friends to go 360. They should be cross-platform at least for the internet. That'd make it so much cooler.
I think the language for the games is different so I don't see how you could possibly get that to work unless Sony and Microsoft were to merge and that would be a disaster.
I find the 360 to be superior to the PS3, but that's just me.