The worldwide sales data is from the combined findings of the US's The NPD group, the UK's MCV and Japan's Enterbrain. Keep in mind that this "worldwide" data only includes the top three game markets, so in reality worldwide sales are even higher.

A couple observations based on this data: Modern Warfare 2's sales were great, but will it hit Activision's goal of becoming the "biggest game of all time?"  I really doubt it. Call of Duty 4 sold for a long, long time and I'm sure MW2 will as well, but there seems to be a lot of disenchantment with the multiplayer's consistent bug issues and we're going into a really strong year for games. Even if MW2 doesn't hit the publisher's lofty goal, it's still clearly one of the biggest games of all time.

Second observation: Nintendo's sales figures are great news for the company and potentially bad news for core gamers. NSMBW is the only core game of Nintendo's four on the list. Yes, it sold the best. But with Nintendo doing so well with fitness games and minigame compilations, what's the incentive to develop costly core games? Of course Mario's not going anywhere. But don't be surprised to see him show up in Mario's Wii Workout Challenge.