Valve Hammer (Half Life map maker) tutorials!
You can find most needed hammer techniques in this tutorial pack.Valve Hammer is a map maker program for Counter Strike and Half Life.
10 Most Common Counter-Strike Mapping Pitfalls
Creating a Streetlight with Light Cone
Lights, lighting and lighting effects
Make a 1 Way Window
R_speed Reduction Methods
Stripping the Weapons from Players
Useful Console Commands
Using the Technique In-game_ Creating Killable Fish that Respawn Every Round
also a surprise mp3!