Fallout: New Vegas exploits

Exploits are "holes" in the game programming which allow a player to do something which the developers did not intend and alter the play balance in a way which cannot be rectified.

=General considerations=
 * Exploits are repeatable consistently.
 * Exploits are attainable with an unaltered game on an unaltered system. Third-party mods must not be present.
 * Exploits give the player some unintended benefit.

Quest-related

 * When doing the first quest to help the town folk get rid of the gang in town, run to the mine and follow a mine worker to the gang's hideout. The mine worker will kill the gang, and you can loot the bodies. Now, complete the quest by going back to town and activate the final fight. You can loot the bodies a second time.


 * In Camp Golf, accept the quest 'Flags of Our Foul-Ups' from Sgt. McCredie, then go talk to O'Hanrahan and mention helping the squad, he'll ask you to talk to the misfits. Go find Razz, the guy with the mohawk, and ask him about his squadmates, as long as you have 40 speech, you can repeat the dialog over and over again for 40xp each time.


 * In the Vegas Strip wenn you talk to the Computer Mr. House you can ask him as often as you want about the "You´re seem more like a computer than a man." Which requires 35 Medicine Skill and give you always 35xp.


 * During 'That Lucky Old Sun', if the Courier chooses Full Region (Emergency output level), the dialogue option with Ignacio to turn in the quest is not removed upon completion. This allows you to obtain 350 XP, 3 Stimpaks, and 2 Doctor's Bags as many times as you like.

Barter- and repair-related

 * The Infinite Money Glitch is back, Go to a store that has two identical items with different values. Buy the cheapest, and you should be able to sell it back for more. Repeat.


 * After the Casino opens in Primm, when you choose to cash your chips in, no chips are removed from your inventory even though you are given currency for the chips. The player can cash chips in indefinitely for an infinite amount of NCR currency, Legion currency, or caps. - Removed in the PC and Xbox 360 Version after patching.


 * In any shop that displays their items out in the open you can pick up the item, take it to a back room, and shut the door. From there you can pocket the item without any people attacking you, go back through the door and sell it back to them. After a while they will display the item again so rinse and repeat. Note in the building in Freeside that sells the energy weapons, no karma is lost. It is the Silver Rush.

Videos
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Flame damage
Flame damage kills do not count against your karma.

Followers
In the middle of battle, talk to your follower. Select the Stay at a Distance and Stay Close option twice. Then exit the command wheel. When you exit your followers health should be fully restored. Note-Done with Boone on PS3 and with Arcade Gannon on Xbox 360 (although sometimes it requires the command to be pressed rapidly 4 or 5 times). Yet to be confirmed on PC.