Wow, I know B3D is in Europe and all, but Madden does sell like 6M copies a year. And it is released on the PS2, Xbox, GCN, Xbox 360, PS3, Wii, PSP, and DS. Madden sold
$100M worth of software in one week last year.
Fast forward to this year. Madden, in August alone, sold nearly 2M units on the 360, PS2, and PS3
alone (360 897K, PS2 644K, PS3 336K). In 2006, the PS2 saw a 180% increase in post August calendar year sales for Madden, and the 360 saw 90%.
This being one of the better Madden releases, the strong marketing push, and the increase in next gen consoles I don't see why Madden wouldn't approach, or exceed, the 5M mark in CY sales.
At over 2M combines sales -- already! -- Madden will have very likely already surpassed the sales for UT3, Uncharted, and Mass Effect in total 2007 sales. Don't freak! I am not saying Madden is better or that those games won't be amazing. 2M is a big number in a couple months.
It will be close between Halo 3 and Madden 2008. Halo 2 had amazing first day sales, huge pre-sales,
and broke 5M in 2004. So I could be wrong, but with the 360 install base being smaller than the Xbox1 at the time, and the cost of a 360 is a hurdle for adoption. But if I had to bet, I would say Halo 3 bests 5M in 2007.