Left 4 Dead has been updated to include a lobby browser. The lobby browser (under Play Online) will show you a list of optimal games available for you to join. The browser pares down the thousands of lobbies and games currently being played to show you the best list of games available to you. This list includes official and add-on campaigns, including add-on campaigns you have not yet installed, making it a great way to discover them. You can filter by difficulty, official and/or add-on campaigns and by lobbies and/or games in progress. The specific changes include:
Left 4 Dead
The Play on Steam Group Server screen now displays which Steam group it's searching while updating the list
After calling a vote to change difficulty in game it is now correctly updated in matchmaking
Add-on Campaigns
When downloading a new version of an add-on and installing it (by double clicking the .VPK file), it will now correctly overwrite the pervious version, even while Left 4 Dead is currently running
Addressed a crash when two mission files with the same name are installed
Steam Group Servers now will now correctly offer download links when running add-on campaigns
Server
The server will now warn if the public or private tags exceed their limits. Public tags are limited to 63 characters. Private tags used for matchmaking are now limited to 1024 characters. Note that the private tags include the name of each add-on campaign installed on the server, so an excessive number of add-on campaigns can hit this limit
SDK
The VPK tool should be able to handle campaigns larger than 500MB now
You can now drag and drop or pass a VPK file to the vpk.exe tool to have it extract the contents of the add-on to a folder. This mirrors the functionality of passing a folder and having it create a VPK file
Detail.vbsp and lights.rad have been added to the distribution
六月 16, 2009 - Left 4 Dead 更新釋出
Left 4 Dead 已經更新，並且同時釋出大廳瀏覽器。大廳瀏覽器（連線狀態下）會顯示一個玩家所能加入的遊戲列表。該瀏覽器比較數千大廳與進行中遊戲後，會在列表中顯示較為適合玩家的遊戲。這列表中包含官方與自製地圖、玩家未安裝的自製地圖，來讓玩家能更方便的進行遊戲。玩家可以以『困難度』、『官方／非官方』、『大廳／進行中』作為篩選的條件。
本次更新中較為明顯的如下：
Left 4 Dead
『STEAM社群伺服器所屬遊戲（The Play on Steam Group Server）』的畫面，現在會顯示正在搜尋並更新伺服器列表的社群。
遊戲中投票調整難度的遊戲後，會正確更新在快速配對機制的篩選條件上
自製戰役
當下載並安裝較新版本的一張自製地圖時（雙擊VPK檔案），現在會正確更新並覆蓋舊版本的檔案，此項動作可以在 Left 4 Dead 執行中時進行。