Here are the top ten most played games on Xbox live this week. Yes you guessed it .... .

GTA4 has made it to number 1 -

Xbox 360 Top Live Titles
1 GTA IV
2 Call of Duty 4
3 Halo 3
4 Guitar Hero III
5 Gears of War
6 Rock Band
7 Tom Clancy's Rainbow Six® Vegas 2
8 Iron Man Demo
9 FIFA 08
10 Forza Motorsport 2

Source