I'm sure this will get some people worked up, especially certain people who claim the 360 can't possibly be at 17 million installed base... Basically Microsoft made two claims today, the first being that the 360 has taken over 40% of the life-to-date revenue for next generation systems. This can likely be explained by the fact that Microsoft is probably counting revenue from the 360's first year when it had no competition. The other claim can only be read one way and that is that the Xbox 360 according to Microsoft has sold through 17.7 million units Worldwide as of March 10th.
http://www.mcvuk.com/news/29865/Microsoft-Almost-half-of-all-games-revenue-is-ours
"Microsoft has staked its claim as the market leader in the console space with two bold claims this morning – not least that it has taken over 40 per cent of ‘life-to-date’ revenue across hardware, games and peripherals sales."
"On top of that, we’ve worked our way to a 17.7 million units worldwide installed base – and Europe is a critical geography within that figure. The ability to continually drive cost through the console is what has allowed us to open up the price of the system now.”