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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 continues to be the top Xbox Live title.

Xbox 360 Top Live Titles (UU’s)
1 Gears of War
2 Call Of Duty 3
3 Small Arms
4 LOST PLANET OnlineDemo
5 SUPERMAN DEMO
6 Madden NFL 07
7 Tom Clancy's Rainbow Six Vegas
8 Rainbow Six Vegas Multi Player Demo
9 Call of Duty 2
10 Oblivion


Top Arcade Titles (Full Versions)
1 Small Arms
2 UNO
3 Contra
4 Ultimate Mortal Kombat 3
5 Street Fighter II' Hyper Fighting
6 Geometry Wars Evolved
7 Texas Hold 'em
8 DOOM
9 PAC-MAN
10 Defender

Original Xbox Top Live Games
1 Halo 2
2 Battlefield 2: MC
3 Madden NFL 07
4 Star Wars: Battlfrnt 2
5 Counter-Strike
6 Forza Motorsport
7 Call of Duty 2
8 Call of Duty 3
9 Ghost Recon 2
10 Rainbow Six 3

From majornelson.com