Yusuf Mehdi (Microsoft’s CMO) has stated on the official Microsoft Blog via technet that the Xbox 360’s sales since the console’s launch is now clocking in at 67 million.

Mehdi wrote: “Since 2005 – when we launched Xbox 360 – we have sold 67 million consoles and have generated more than $56 billion at retail, and we’re still going strong in our seventh year. With 47% share of the current-generation console market, we are hitting our stride largely as a result of the success of Kinect for Xbox 360 (19 million sold ) and the flood of new entertainment options through Xbox LIVE (40 million members).”

[Source]