According to Major Nelson, Gears of War is the first game to top Halo 2 based on Xbox LIVE weekly activity. Congrats to Epic and Cliffy B!
These lists are based on global unique users connected to Xbox Live.
If the Xbox 360 list and the original Xbox list were combined, then Gears of War would be the top Xbox Live title. To put it another way: Gears of War is now the top game on Xbox Live.
Xbox 360 Top Live Titles (UU’s)
1 Gears of War
2 Call Of Duty 3
3 Contra
4 Call of Duty 2
5 Madden NFL 07
6 RAINBOW SIX VEGAS Demo
7 Tony Hawk's Project 8 Demo
8 Splinter Cell Double Agent
9 Ghost Recon 3
10 Need for Speed™ Carbon
Top Arcade Titles (Full Versions)
1 Contra
2 Defender
3 UNO
4 Ultimate Mortal Kombat 3
5 DOOM
6 LUMINES LIVE!
7 PAC-MAN
8 Street Fighter II' Hyper Fighting
9 DIG DUG
10 Texas Hold 'em
Original Xbox Top Live Games
1 Halo 2
2 Battlefield 2: MC
3 Madden NFL 07
4 Counter-Strike
5 Rainbow Six 3 BA
6 Star Wars: Battlfrnt 2
7 Call of Duty 3
8 Forza Motorsport
9 Call of Duty 2
10 Rainbow Six 3