Props to GameSpot for the following cheats in the following link:

"Call Of Duty: Modern Warfare 2" Cheat Codes, Unlockables, And More Codeleakers Style So You Know They Are Extra Greesy!

*Rank Boosting Glitch*
If you want to boost your level/rank up all you have to do is follow this simple steps. Many people know how to do this already but if you are just discovering.

1. Invite a friend to a 1v1 Cage Match or find a player online to do this with you. Remember you cannot do this in Player Hosted. Remember this all must be done while connected online on Playstation 3, Xbox 360, PC.

2. Spawn your soldier with a Riot Shield weapon class.

3. When your in the server with your friend, you take turns having someone rank up. The friend that is ranking/leveling up will get killed by the other five times (or four) so they can give their friend a Sentry Gun to rack points off of using a Riot Shield.

4. You should be gaining a large amount of points, but I heard you should drop the Riot Sheid every few seconds because if you rack points in one life for too long you may not be able to get as many points the next time.

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