Microsoft: 17.7 million Xbox 360s and 8.1 million copies of Halo 3 sold worldwide
 

Microsoft press release:

- 17.7 million Xbox 360 consoles have been sold worldwide

- 8.1 million copies of Halo 3 have been sold worldwide

- Mass Effect sold 1.6 million copies in six weeks

- The attach rate for the Xbox 360 console is 6.9


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It's amazing that 8.1 million copies of Halo 3 have been solid in four months, considering Halo 2 has sold 8 million copies to date. Also, an attach rate of 6.9 is insane, and is surely the prime reason why third party developers are flocking to the 360.

Re: Microsoft: 17.7 million Xbox 360s and 8.1 million copies of Halo 3 sold worldwide
 

Good job of Halo 3. Metroid Prime 3 has only sold 1.1 million copies so far. Not even as many as MP2.

Re: Microsoft: 17.7 million Xbox 360s and 8.1 million copies of Halo 3 sold worldwide
 

Nintendo's embarassing marketing campaign is partly to blame.