Looks like Halo 3 is going to be riding the #1 spot for a while. They’ve been sitting in there for several weeks now.

From Major Nelson’s blog-

Xbox 360 Top Live Titles (based on UU’s)

1    Halo 3
2    Call of Duty: WaW
3    Call of Duty 4
4    Gears of War 2
5    GTA IV
6    UFC 2009 Undisputed Demo
7    FIFA 09
8    UFC 2009 Undisputed
9    Left 4 Dead
10   Fallout 3

Top Arcade Titles (Full Versions purchased)

1    Castle Crashers
2    Peggle
3    Hasbro Family Game Night**
4    Worms
5    Teenage Mutant Ninja Turtles 1989 Classic Arcade
6    UNO
7    Star Trek: D•A•C
8    The Dishwasher: Dead Samurai
9    Gel
10   Banjo-Tooie