Source: PlanetHalfLife

Interlopers.net has put online 8 brand new and great Half-Life 2 mapping tutorials, the new tutorials cover:

-Creating Cliffs
-Adding Wind Effects
-3D Skybox
-Breakable glass in rotating door
-Ambient Sound
-Ragdolls on a moving rope
-Env_beam
-Adding custom textures

Check the new and the previously added tutorials out at Interlopers.net.