Today stats

[current players] [peak]
  24,298  102,830    Call of Duty: Modern Warfare 2 - Multiplayer
  15,630  89,928    Counter-Strike: Source
  12,784  73,748    Counter-Strike
  10,262  17,773    Team Fortress 2
  6,294  12,959    Left 4 Dead 2
  3,367  11,288    Empire: Total War
  2,732  13,138    Call of Duty: Modern Warfare 2
  2,521  21,271    Football Manager 2010
  1,727  6,955    Aliens vs Predator
  1,687  5,138    Garry's Mod
  1,599  4,295    Left 4 Dead
  1,484  2,652    Napoleon: Total War
  1,452  4,003    Warhammer 40,000: Dawn of War II
  1,297  8,785    Condition Zero
  1,265  2,258    Supreme Commander 2 Demo
  1,245  2,475    Mass Effect 2
  1,150  2,924    Battlefield: Bad Company 2 Beta
  1,080  5,988    Day of Defeat: Source
  1,063  1,962    Global Agenda Live
  986  1,856    Star Trek Online
  790  1,574    Dragon Age: Origins
  788  1,695    Killing Floor
  664  1,411    Mount and Blade
  597  1,189    Mass Effect
  592  4,971    Football Manager 2009
  569  2,001    Half-Life 2: Deathmatch
  556  1,046    Borderlands
  542  1,461    Half-Life 2
  512  896    S.T.A.L.K.E.R.: Call of Pripyat
  460  1,081    Grand Theft Auto IV
  421  757    Plants vs. Zombies
  411  1,552    Day of Defeat
  375  719    BioShock 2
  352  705    Titan Quest: Immortal Throne
  350  633    Torchlight
  345  607    Sid Meier's Civilization IV: Beyond the Sword
  287  815    America's Army 3
  271  716    Company of Heroes: Tales of Valor
  267  683    Saints Row 2
  261  467    EVE Online
  224  527    Company of Heroes
  221  601    Pirates, Vikings, and Knights II
  203  519    Rome: Total War - Gold Edition
  186  363    BioShock
  178  364    Portal
  174  407    Medieval II: Total War
  168  497    Half-Life 2: Episode Two
  168  282    Audiosurf
  160  296    EVE Online Demo
  150  279    S.T.A.L.K.E.R.: Shadow of Chernobyl
  149  324    Wings of Prey
  146  267    Sid Meier's Civilization IV
  135  381    Half-Life 2: Episode One
  134  423    F.E.A.R. 2: Project Origin
  130  448    Zombie Panic! Source
  129  270    Serious Sam HD: The First Encounter
  125  454    Aliens vs Predator Demo
  119  248    The Elder Scrolls IV: Oblivion - Game of the Year Edition
  116  484    Insurgency: Modern Infantry Combat
  116  242    Star Wars: Knights of the Old Republic
  113  190    Tropico 3: Steam Special Edition
  111  376    DiRT 2
  109  227    Street Fighter IV
  106  191    Fallout 3
  105  197    Defense Grid: The Awakening
  104  313    Battlefield 2
  104  280    NBA 2K9
  103  372    Company of Heroes: Opposing Fronts
  101  320    Half-Life
  101  188    Titan Quest
  100  761    TrackMania Nations Forever
  99  233    Call of Duty 4: Modern Warfare
  97  166    X3: Terran Conflict
  94  265    Team Fortress Classic
  94  187    Far Cry 2