The Stim Package map pack also happens to be a timed Xbox LIVE exclusive, so Microsoft is rewarding the most loyal of fans who purchased the DLC on day one. What kind of reward, you ask? Free Xbox LIVE Gold for a full week.
How do you know if the reward applies to you? First-day buyers can check their inboxes for this message:
To thank you for your loyalty to Xbox Live and for buying the Modern Warfare 2 Stimulus Package on day 1, we will extend your Gold membership for 7 more days of adrenaline-pumping action with your friends on LIVE. Your account will be updated by May 1.