Well, you have a few numbers to go by:
The X360 sold *roughly* 70% more units week-over-week vs. August. With no truely major hardware-selling games outside of Halo, and Eternal Sonata.
So I'd say that it *seems* like Halo 3 might of moved 150k to 300k units.
*however*, the more important thing: it seems that the release of Halo 3, more than anything, started moving X 360s based not only on Halo (due to the fact the X360 didn't have a huge spike that week, but a gradual climb) shows that in many gamers minds, Halo 3 was just one of the games they want.
So really, the issue is: how many units can you say a game like Wii Sports or Halo 3 moves when there isn't a huge unexplained spike, but a stronger trending of sales?
So IMO, it seems, more than anything, Halo is a mere reason for what seems to be extra hundreds of thousands to buy a X360, ontop of whatever other games they want (primarily Oblivion and Gears of War), rather than everyone *just* buying the 360 for Halo - after all, we'd see US sales plummet down to 70k/wk, but instead their 50,000 units/wk above that.
Back from the dead, I'm afraid.
