Take-Two has revealed in its latest fiscal earnings report that Bioshock 2 has managed to ship more than three million units worldwide since releasing on February 9. The report also says the first game has now sold over four million copies worldwide across all platforms, "bringing the total sales of the franchise to 7 million units." Of course, the important distinction here is that "shipped" does not equal "sold," as Take-Two infers above.
Still, getting three million copies out there into the world is a pretty noteworthy feat. Get yourself a couple more million and you'll be able to finance construction on your own underwater metropolis -- not that any good could possibly come of it.