I've heard in rumors that PSN and XBL users will be able to play cross-console/cross-company with each other. I do not know if this is confirmed or true but if someone does know, please let me know (preferably a Bungie employee).
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Yep...It's possible. [spoiler]All you need is and xbox a playstion 2 tv, cables and such 2 copy's of the game and room for your friend to sit next to you. [/spoiler]