Update #6: "The MW2 Title Update is now live! It may take a few minutes for everyone worldwide to get it - our apologies for the delay." Not our words - the words of Xbox Live's Major Nelson. "It may take a few mins for you to get the update, or for it to work properly. Once things get in order all should be fine."
Update #5: The update may take four hours to deploy. "Stimulus Package update: The Title Update is currently being prepped, but could take four hours to appear everywhere once it's read," Tweeted Daniel Maher, Xbox Live editor.
"Right now the team getting things in order so this will be fixed VERY soon (within hours)," added Nelson
Update #4: Major Nelson: "If you're getting 'Can't download the update' that's us putting the latest update in place. Excuse our dust, we'll be done ASAP."
Update #3: Hryb has offered another update: "I'll have another update in about 30-mins. Until then, you may see some weirdness if you try to download the map pack or update," he Tweeted.
Update #2: Larry "Major Nelson" Hryb's said the Stimulus Package wasn't released properly.
"The Stimulus Package needs a Title Update and it didn't go out properly. We're pushing it out now - it won't be long," he Tweeted.
Update #1: Major Nelson, the voice of Xbox Live (and Larry Hryb) has waded in. "The engineers are already engaged and working on the MW2 Stimulus Pack problem. They'll get it corrected," he tweeted, moments ago.
Original story: The Modern Warfare 2 Stimulus Package has been released on Xbox Live and does not work.
"Stimulus Package update: We're looking into why they aren't working, but we suspect a new title update is required and is due shortly," Tweeted Xbox Live editor Daniel Maher who, incidentally, has "no direct control over the content". "Messenger = shot," he added, in a later Tweet.
We'll keep our eyes peeled for any mention of a fix.
Inside the Modern Warfare 2 Stimulus Package are five extra maps. Three are brand-new and two return from Modern Warfare 1. They'll add "so much mileage" that "no one's going to be disappointed", according to Infinity Ward community man Robert Bowling.
The Stimulus Package costs 1200 Microsoft Points (£10.20/€14.40).
Head over to our full interview with Bowling to find out more.