Updates to Source SDK have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Enhancements
* Particle Editor, Material Editor, and Commentary Editor are now included in the Source SDK
* Updated SDK source code for Orange Box mods
* Added example particle system files to SDK content
Bug Fixes
* Updated Linux binaries and makefiles for dedicated servers and server plugins
* The Faceposer phoneme editor now pops up a warning message when a phoneme cannot be saved
* Fixed crash in 'splitskybox.exe'
* Day of Defeat: Source now appears in the list of Orange Box games
Source: http://www.steampowered.com/v/index.php ... 1690&cc=US