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There are several games on Xbox Live and "Games for Windows Live" where PC gamers and Xbox gamers can play together.
I don't see Sony and Microsoft ever joining together and it's probably better that they don't, it would hurt competition and whatever they came up with would be all there is and no more choices for consumers.
Both the PSN and XBL have their strengths and weaknesses, I don't think a "one size fits all" system would ever work. You'd get into more than just unifying networks, but also unifying everything into one console system, which would be bad.
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