Please post your tips and tweaks in here.
Accessing the console in game:
Right click on Counter-Strike: Source in your games library, select Properties.
Click on Set Launch Options, type in -console
in the box.
To bring down the console in game, hit the tilde key ~ (next to the 1 key on your keyboard)
In game, bring down the console, type in: hud_fastswitch 1 (to change weapons quicker)
Map to dark? Go to:
open config.cfg, find mat_monitorgamma_tv_enabled "0" and change to mat_monitorgamma_tv_enabled "3" (or any number 1-3)
Change to pistol when walking, you'll move much faster than you would if you were to carry a larger weapon.