Steam now offers an automatic patch for Team Fortress 2, Counter-Strike: Source and Day of Defeat: Source, addressing a few bugs and closing off an exploit. There's also a Portal update to fix bonus map import dialog. Finally, a new automatic patch for Left 4 Dead 2 has fixes for the zombie shooter sequel, which are outlined below.

• Added additional protection for critical files
• All add-on files will be loaded when connecting to a Non-Official server regardless of game mode
• Only approved custom maps will be loaded when connecting to an Official server
• Player's can print the contents of the consistency list with "cl_print_consistency_list". If the server has sv_consistency disabled, the user will be notified when they attempt to print the list
• Improvement to Hammer load times