If you're playing Call of Duty 4 on the PC, you have yet another reason to make fun of the poor saps playing on their 360. Not only do they not get to use a mouse to aim, but they have to pay for something you’re getting for free.

The new 1.6 patch for Call of Duty 4 adds Broadcast, Killhouse, Creek, and Chinatown, four multiplayer maps that cost 800 points on Xbox Live. That's $10 in the Real World. Multiplied by 1.5 million downloads since it was released a month ago, that's $15 million of extra revenue and a record for downloadable content on Xbox Live. It's also been available for $9.99 for a few weeks on the Playstation 3, but, well, that's the Playstation 3.

In related news, Call of Duty 4 just hit the 10 million copies sold mark. It couldn't have happened to a nicer game! Read about it here, where the head of the development studio, Vince Zampella, plays coy about how many copies sold on each platform. Sure you don't know, Vince!