Updates to Left 4 Dead 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Left 4 Dead 2

• New mutation: Last Man On Earth
  
• Blocked a map exploit at the start of The Passing
  
• Fixed a crash if a Spitter lost her spit target mid-attack
  
• Updated video config for new NVIDIA cards
  

Updates to Left 4 Dead and Left 4 Dead 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Left 4 Dead

• Fixed an issue where servers wouldn't relist after the master server was bounced
  

Left 4 Dead 2

• Fixed a Linux dedicated server crash