Here is the top ten games played on Xbox live this week.

1 Halo 3
2 Call of Duty 4
3 GTA IV
4 Gears of War
5 Guitar Hero III
6 Rock Band
7 Battlefield: Bad Company
8 SOULCALIBUR IV
9 Tom Clancy's Rainbow Six Vegas 2
10 Geometry Wars Evolved²

Halo 3 has managed to overtake COD4 again this week.

Source