[-]January 15, 2008 - Garry's Mod Update Released
Updates to Garry's Mod have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Garry's Mod
Switched to use the Orange Box Engine
Added support for Team Fortress 2, Half-Life 2: Episode Two and Portal
Updated Spawnmenu
Updated gm_construct
New loading screen
New 'Start Game' menus
Lamps now cast shadows (if supported by hardware)
Too bad it breaks dedicated servers. I would let you know if ULX worked, but my dedicated server wants to run Day of Defeat now after the update.