Updates to the Source SDK have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
New Features
- Visual Studio 2005 Support for SDK Code
- Spectate Mode Added to Half-Life 2: Deathmatch
Bug Fixes
- Faceposer Crashes When When Trying to Extract or Add a .txt File
- Lag compensation added back into Half-Life 2: Deathmatch