Before you start any of the below, make sure you have the console enabled (it is in the options menu), and that you can easily open it.
To load a map with cheats, type the following in console:
/devmap mp_dawnville
Of course you can use any map you like, not just Dawnville. The /devmap command allows you to perform cheats on your server, so you can get things such as god mode, health, ammo, noclip etc.
Now that you have enabled cheats on your server, you can use the following commands:
/god
God mode (i.e. invincibility)
/noclip
No clip (i.e. you can fly and move through objects)
/ufo
Similar to noclip, except you stay on the same plane unless you press jump or crouch.
/give all
Gives you all weapons and full ammo. If you are playing a map that DOESN'T have all of the weapons in it (eg. any stock map), the server will kick everyone because it needs to precache all of the weapons. It will usually say something like mp_weapon bar not precached. After it kicks you, just reconnect and you will be able to do /give all to get all of the weapons. Only do this on a dedicated server. It will kick you so just reconnect to have it work properly.
/give health
Gives you full health
/give ammo
Gives you full ammo for the weapon you have selected (be aware that this may cause some CoD servers to crash)
/g_gravity
Changes the gravity, obviously

/g_speed
Changes the speed you walk at, default is 190.
How to bind the above commands:
It's simple! Just type the following commands in the console:
/bind ? god
/bind ? noclip
/bind ? give ammo
/bind ? give health
Obviously change '?' to whatever you want to set the key to.
User-side commands
/cg_drawfps 1
This shows your fps (frames per second) in the top right hand corner of your screen. The higher it is, the better.
/cg_drawfps 2
This shows more detailed information about your fps, but I'm not exactly sure what it all means

/cg_drawfps 0
This removes the fps from being shown (i.e. if you don't want the fps to be shown on the screen anymore then type this).
/com_maxfps 125
This sets the maximum fps as 125, so if you computer is fast enough it will be at a constant 125fps. 125 fps is good because it means that you can jump higher. 333 fps allows you to jump even higher apparantly.
/cg_thirdperson 1
Toggels 3rd person view on.
/cg_thirdperson 0
Toggels 3rd person view off.
If you have any more commands you think should be on the list then please make a reply to this topic, if not then please do not post in this topic
That's about it. Remember, only post in here if you have any other commands/ideas to add. If you don't then please don't post. I will add the relevant details to the above and delete your post.
Be sure to visit the following site for the whole list of RCON commands:
http://www.infinityward.com/cod/server%20commands.html