Heres a few more stats for you:
GTAIV Stats - The World's Gone To Liberty City...
The Gamerscore Blog team have just sent me through some GTAIV stats - these are US only, but it makes for some reall interesting reading!
"The Gamerscore Blog would like to congratulate Rockstar on the launch of Grand Theft Auto IV. GTA sold over 6 million units, and broke the entertainment record with over $500 million in sales.
We got some data from the US team, and we’re here to share that news with you:
Actual MS sales data from last week shows Xbox 360 console sales at retail went up 54% week-over-week as a result of GTA's success
According to retailers more than 60% of all GTA games sold in the first week were the Xbox 360 version
Retailers are telling us that the game is attaching strongly to new console sales, with roughly 40% of new consoles selling with a copy of Grand Theft Auto IV
Regarding Xbox LIVE:
In the first week, more than 2.3 million people played Grand Theft Auto IV on Xbox LIVE
GTA IV is now the number one played game on Xbox LIVE
Over the weekend, we saw the Xbox LIVE service reach 1 million concurrent users
Gamers have unlocked more than 12 million achievements worth over 100 million gamerscore points in GTA
Grand Theft Auto IV set a new record for time played, with the average gamer spending more than four hours playing the game on LIVE in the first week alone"
From aceybongos who got it from gamerscoreblog