Nice Post Gay
Provided some useful commands, I'll add some that i feel come quite handy:
 

net_graph           --   Enables network hud_text              -->  values : 0 = None; 1, 2, 3;
net_graphpos     --   Set position of net_graph                -->  values : 0 = Left-Down; 1,2,3; anticlockwise;
cl_showfps         --   Shows fps                                        -->  values : 0 = Off; 1  On;


#This command is useful for low net player's.
cl_dlmax             --   Block size of chunk decals
                                     (sixe of packets downloaded) --> values : 64, 128, 256, 512, 1024;


#Trying to set a higher value of fps might not be able withou t:
#fps_max 500 
fps_override       --   Forces higher fps                            --> values : 0 , 1;


cl_himodels        --   Sets High/Low res players model           --> values : 0 ,  1;
    / cl_minmodels;

#Since server allows movement speed up to 2000.0 units, player can set higher default speed:

cl_forwardspeed -- forward speed value     -->  values from 0 to 2000, use : 1000;
cl_backspeed     -- Idem back axis              -->  Idem, set same values on all axis;
cl_sidespeed      -- Idem sides                     -->  Idem;
cl_upspeed        -- Idem jump                      --> Idem;

#Some servers will reset this values, to default 320 units per axis;


#Mute all audio ingame:

volume                                                         --> do 0 for no audio, 
                                                                               set to flloat value 0.08 , to reset audio;

#Mute chat:                                                 

hud_saytext                                                 --->set 0 disables chat hud display; 1 resets;


#Bindings, press a key to trigger an action;
#Dont bind game reserved key as: keys "asdwrg1234 Tab, Left shift ....."

bind "Key To bind" "Command"   -- example bind "b" "say hello"  -->when b key pressed hello will be sent as chat message.

Some useful usages:

bind "f" "say /guns"  --> opens guns menu when f key pressed;

bind "b" "say /shop" --> opens shop menu when b key pressed;

multiple commands can be called;

bind "b" "say /guns;wait;say /shop;wait;slot1;say /shop;wait;slot7;wait;say rtd;wait;name GAY;wait;b;wait"
                     1                      2                 2           3                 3                   4                    5                6          

;wait; is needed to allow time to execute each individual command, semicolons also end statement;
upper command would execute:
1 say /guns -> open guns menu
2 say /shop -> opens shop  -> select slot1 -> buys heal from store;
3 say /shop -> opens shop  -> select slot7 -> buys speed from shop;
4 say rtd      -> call rock the dice;
5 name GAY -> renames player;
6 b                -> calls the binding on b key -> recalls the whole function from begining goto 1;





.... .- .--. .--. -.--

Quote by violeNt :

Here is my contribution:
 

The best guis for c.s has almost everything, just install the choice, the one I use incredibly is not here but I can make it available if you want...

http://rockdown.net/Customize/Gaming/Counter-Strike/GUI/

 

my launch options:
 

-nomsaa -nofbo -freq 120 -32bpp -heapsize 1048576 -nojoy -high -noipx -noforcemaccel -noforcemparms -noforcemspd

r_mmx 1  -> transfers some of the memory off of your cpu to your video card.

ex_interp -> sets the amount of time to interpolate in between each successive update.Set this  to 0, CS  will set to 1/cl_updaterate
                    which is the correct amount to update. you can test constant values as 0.01,

                    This command affects directly your aim.
 

Quote by w201 :

 

                    This command affects directly your aim.
 

who needs aim in deathmatch maps ?
i shoot on everything that moves