Activision and Microsoft are exploding with joy over the performance of the new Call of Duty: Modern Warfare 2 "Stimulus Package" map pack, proclaiming today that the downloadable add-on "shattered Xbox LIVE records" to the tune of 2.5 million sold.

One million of those purchases and downloads occurred within the first 24 hours, according to a statement from Activision. In dollar terms, that's over $37 million USD in revenue in the map pack's first week on the market, a clear sign that 2.5 million people quickly came to grips with the Stimulus Package pricing.

Keep in mind that's just one week on a single platform, as Microsoft locked down the Modern Warfare 2 map pack as a timed exclusive for the Xbox 360. We're sure Activision will be further swimming in it when the Stimulus Package goes wider and the next collection of downloadable content comes to Call of Duty fans.