Tonight Treyarch released Patch 1.4 the PC version of Call of Duty: World at War. It includes some vital fixes for the game but more importantly, it's got free multiplayer maps.

These are the full patch notes for 1.4, courtesy of the official COD forums:

• 3 new Multiplayer maps: Kneedeep, Nightfire, Station!
• Nazi Zombies map with more weapons, Perks-a-Cola machines, and electroshock defenses: Verrückt!
• Improved spawning logic.
• Auto balancing improvements. Players are no longer auto balanced while completing objectives.
• Mods: IWD’s can be placed in the usermaps folder.
• Mods: Hold Breath / Sprint functions as intended.
• Mods: MissingAssets.csv is generated when maps are run with developer set to 1.
• Fixed lag caused by shooting at tanks.
• All rifle grenades fired during the first 15 seconds of Search & Destroy will be duds.
• Players who equip a Bouncing Betty and melee teammates in Hardcore game modes are now credited with a team kill penalty.
• Players are now deducted 200 points for team killing the bomb planter/defuser in Hardcore Search & Destroy.
• Martyrdom no longer causes direct impact deaths in Hardcore modes.
• “Bayonet jumping” has been disabled.

The map pack, which costs 800 Microsoft Points ($10) to download for the PS3 and Xbox 360, is free for the PC due to a "partnership with Intel". Map Pack 1 was released through PSN and Xbox Live on March 19th.