GoldSrc Model Workflow (3DStudio Max, Blender, MilkShape 3D, kHED & Maya):
http://www.the303.org/tutorials/gold_mdl.htm

Model QC glossary:
http://www.the303.org/tutorials/gold_qc.htm

Troubleshooting Guide:
http://www.the303.org/tutorials/gold_mdl_fix.htm

Procedural Mouth (talking) Animation:
http://www.the303.org/tutorials/gold_flappyjaws.htm

Color Remap & FullBright guide:
http://www.the303.org/tutorials/gold_remap.htm
http://www.the303.org/tutorials/sven_fullbright.htm

Baked Physics Cinematic Guide:
http://www.the303.org/tutorials/gold_mdl_phys.htm