Xbox Live Top 10

Xbox 360 Top Live Games
1 Call of Duty 2
2 Ghost Recon 3
3 Oblivion
4 BFMC
5 PGR3
6 Final Fantasy XI
7 Rockstar Table Tennis
8 EA SPORTS™ Fight Night Round 3
9 Perfect Dark Zero
10 Hitman: Blood Money Demo

Original Xbox Top Live Games
1 Halo 2
2 Battlefield 2: MC
3 Counter-Strike
4 Splinter Cell Chaos
5 Pro Evolution Soccer
5 6 Rainbow Six 3 BA
7 Madden NFL 2006
8 Star Wars: Battlfrnt 2
9 Forza Motorsport
10 Ghost Recon 2: SS

(thanks to MajorNelson.com) According to Major Nelson, Halo 2 is still #1, even though they are now doing the Xbox 1 top 10 and the Xbox 360 top 10.