A slide shown at a Xbox 360 presentation in Spain is basis for a rumor that Valve's next iteration of the ultra successful Half Life game might come to the Xbox 360.
Half Life fans are already concerned that Half Life 3 might then not come first to the PC. Arguments against the Xbox 360 Half Life rumor are the extensive modding community for HL. Microsoft would need to support that to really get existing Half Life players to switch to Xbox 360.
More details on Slashdot. See also how Sony plans to battle the Xbox 360.
Half Life Game Deals
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