Wow. I was not expecting to see Halo 3 retake the number 1 spot, but I guess a new map that is free helps

Xbox 360 Top Live Titles (based on UU’s)
1 Halo 3
2 Call of Duty 4
3 GTA IV
4 Gears of War
5 Guitar Hero III
6 Rock Band
7 Too Human Demo
8 Battlefield: Bad Company
9 Tom Clancy's Rainbow Six Vegas 2
10 FIFA 08

Top Arcade Titles (Full Versions)
1 Golf: Tee It Up!
2 SOULCALIBUR
3 UNO
4 DOOM
5 Worms
6 Schizoid
7 N+
8 Geometry Wars Evolved
9 Wolf of the Battlefield: Commando 3
10 Coffeetime Crosswords
The above arcade list is based on full versions purchased.

Original Xbox Top Live Titles (based on UU’s)
1 Halo 2
2 Star Wars: Battlfrnt 2
3 Fable
4 Counter-Strike
5 Battlefield 2: MC
6 Call of Duty 3
7 Street Fighter Anniv.
8 Fable: Lost Chapters
9 Splinter Cell Chaos
10 Guilty Gear XX #Reload

These lists are based on global unique users connected to Xbox Live or in the case of Arcade, full versions purchased that week.