Major Nelson just posted the latest top 10 Xbox LIVE activity list.  To no ones surprise Gears is still on top, while the surprisingly addictive Heavy Weapon takes the top spot for Xbox LIVE Arcade.

Xbox 360 Top Live Titles (UU’s)
1 Gears of War
2 Tom Clancy's Rainbow Six® Vegas
3 Call Of Duty 3
4 Lost Planet
5 Madden NFL 07
6 Oblivion
7 Saints Row
8 Ghost Recon 3
9 UNO
10 Call of Duty 2


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

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