Just noticed these over at Major Nelsons’ blog. Some interesting stuff. Stats based on Xbox LIVE connectivity and unique users.
Xbox 360 Top Live Titles
1 – Halo 3
2 – Call of Duty 4
3 – GTA IV
4 – Gears of War 2
5 – Gears of War
6 – CoD: World at War
7 – Guitar Hero III
8 – Battlefield: Bad Company Demo
9 – Star Wars: The Force Unleashed Demo
10 – Rock Band
11 – Fable II
12 – Mirror’s Edge Demo
13 – Madden NFL 09
14 – BF: Bad Company
15 – Rainbow Six Vegas 2
16 – UNO
17 – Castle Crashers
18 – COD: World at War Multiplayer Beta
19 – Forza Motorsport 2
20 – Too Human – Demo
No major surprises there apart from perhaps the Call of Duty: World at War position, at 6th its pretty high up there considering its mid November release date, the beta also makes it in on its own at 18th. Also interesting to see 2 Arcade titles, and 4 demos making the top 20.
Top Arcade Titles (Full Versions purchased)
1 – Castle Crashers
2 – Geometry Wars: Retro Evolved 2
3 – Braid
4 – A Kingdom for Keflings
5 – UNO
6 – Super Street Fighter II Turbo HD Remix
7 – Fable II Pub Games
8 – Duke Nukem 3D
9 – Bionic Commando: Rearmed
10 – Worms
11 – SOULCALIBUR
12 – Portal: Still Alive
13 – DOOM
14 – 1942: Joint Strike
15 – Bomberman Live
16 – MEGA MAN 9
17 – N+
18 – Wolf of the Battlefield: Commando 3
19 – Marble Blast Ultra
20 – Ultimate Mortal Kombat 3
Still need to pick up Castle Crashers, but have far to much stuff to play at the moment… Good to see N+ in there 
Original Xbox Top Live Titles
1 – Halo 2
2 – Fable
3 – Star Wars: Battlefront 2
4 – Counter-Strike
5 – Fable: Lost Chapters
6 – Doom 3
7 – Conker: Live Reloaded
8 – Splinter Cell Chaos
9 – Star Wars: KOTOR
10 – SW: Republic Commando
11 – Star Wars: Battlefront
12 – Burnout 3
13 – Guilty Gear XX #Reload
14 – Gauntlet Seven Sorrows
15 -Call of Duty 3
16 – Ninja Gaiden Black
17 – Crimson Skies
18 – MechAssault 2
19 – Call of Duty 2
20 – Rainbow Six 3
I didn’t even realise that Fable: Lost Chapters was available as well as the original release.