With a 400k debut, Bioshock has a pretty legitimate shot at 1,000,000 units long term. For a sense of scale though - even in week two Madden (across all platforms) - outsold the game.
With the Americas data now in, it is time for the weekly look at Vgchartz sales data. For the week ending August 25, Xbox 360 saw the release of a key release - Bioshock. Additionally, numbers for Madden NFL 2008 in week two across all platforms were quite similar to the debut of Bioshock. That said, it is important to note that Xbox 360 hardware did not see a boost. For more on the current generation hardware sales (PS3,Wii, 360, DS, PSP) as compared to last week, check the chart.