Activision released its 1.4 patch for Call of Duty and has finally made the CoD community happy by including PunkBuster. Along with anti-cheat support they have included a new multiplayer map [Stalingrad] and a few game/multiplayer bug fixes.
Note: If you run the dedicated Linux server, get the 1.4 updated version.
Get the full scoop here: Call of Duty 1.4 Patch
[Did I really just say “scoop”?]