7 Months Ago, Shacknews says (in Patch: Left 4 Dead 'Survival Pack' Update Hits PC) The free Survival Pack update for Valve's multiplayer zombie-killer Left 4 Dead has been released on PC, following the debut of the Xbox 360 downloadable content this morning. The update adds a new fast-paced Survival Mode and 16 specialized maps to the game, and enables the Dead Air and D...

9 Months Ago, Blake Ellison from Geek.com says (in Left 4 Dead patched 4 Xbox 360) Last month’s major Left 4 Dead patch that brought a ton of balance tweaks and exploit fixes to the PC version of the zombie-fleeing shooter has now been carried over to the Xbox 360. The change list is essentially the same as the PC patch, just without the PC-specific fixes relating to things...

And Softpedia says (in Left 4 Dead Receives Patch for Xbox 360 A lot of issues have been ...) Game Guru
The game went on to become very popular, thanks to its seamless interaction with Valve's Steam online service, which provided a solid multiplayer and sold extremely well, on the PC and on the Xbox 360. A few weeks ago, PC users of Left 4 Dead received ...

And Administrator from Game Guru says (in Patch: Left 4 Dead update for Xbox 360 now Available) An update for Left 4 Dead for the Xbox 360 is now available on Xbox Live. The update has some new content as well as tweaks and fixes for the game and is absolutely free. So if you have Left 4 Dead...
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And CVG Online says (in Left 4 Dead 360 patch out) Exploits fixed, Smoker powered-up.
Valve has finally released the Xbox 360 patch for Left 4 Dead, which should be streaming down from Xbox Live now.

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And Planet Xbox 360 says (in Patch: Massive Left 4 Dead (Xbox 360) Update Now Available) A free update for the Xbox 360 version of Left 4 Dead is available now via Xbox Live. The update includes a host of fixes, tweaks and new features, including enhancements to Versus mode. The full awesome-change list is after the jump.

And MIG-31 from DriverHeaven.net says (in Patch: Left 4 Dead Xbox 360 Update Released) A free update for the Xbox 360 version of Left 4 Dead is available now via Xbox Live. The update includes a host of fixes, tweaks and new features, including enhancements to Versus mode for improved competitive play.
Source: Gamershell A free update for the Xbox 360 version of Left 4 Dead is av...

And xe360.com says (in Patch: Left 4 Dead Update Released) A free update for the Xbox 360 version of Left 4 Dead is available now via Xbox Live.