Activision has begun tooting its horn again regarding sales of their latest mega-blockbuster hit, Call of Duty: Modern Warfare 2.

Not only did Modern Warfare 2 sell an incredible 4.7 million units on day one, and gross an amazing $310 million, Activision now informs us that in a five day period following the launch of Modern Warfare 2, the game has become the “biggest entertainment launch in history” and has “set a new worldwide estimated five-day sell-through record of approximately $550 million, according to internal Activision estimates.”

Lots of estimations in there, but amazing if accurate.

To go along with their estimates, Activision released a few comparisons to the rest of the entertainment industry, just to put the numbers in perspective:

• The largest reported five-day opening worldwide box office gross figures, held by Harry Potter and the Half-Blood Prince ($394 million)
• The largest reported five-day opening domestic box office gross figures, held by The Dark Knight ($203.8 million)
• The largest reported five-day worldwide video game sales record, previously held by Grand Theft Auto IV (6 million units, $500 million)
• The largest reported opening first-day domestic box office gross figures, held by The Dark Knight ($66.4 million)
• The largest reported first-day book sales in dollars, held by Harry Potter & The Deathly Hallows ($220 million)
• The largest reported first-day worldwide video game sales record, previously held by Grand Theft Auto IV (3.6 million units, $310 million)

Additionally, Modern Warfare 2 has broken records on Xbox LIVE, with the following interesting titbits released by Microsoft:

• More than 5.2 million multiplayer hours were logged playing Call of Duty: Modern Warfare 2 on the first day alone.
• More than 2.2 million unique gamers played Call of Duty: Modern Warfare 2 in one day on November 10th. A new one-day record for Xbox LIVE.
• More than 11 million achievements were unlocked on Call of Duty: Modern Warfare 2 on the first day.

Naturally, Activision Blizzard CEO, Bobby Kotick, was in a good mood:

“In just five days of sell through Call of Duty: Modern Warfare 2 has become the largest entertainment launch in history and a pop culture phenomenon,” said Kotick, no doubt beaming.

“The title’s success redefines entertainment as millions of consumers have chosen to play Modern Warfare 2 at unprecedented levels rather than engage in other forms of media.”

Data from NPD for the month of November is going to be extremely interesting…