Infinite Caps (Pre-Patch)
Go to the town of Primm and complete the 'My Kind Of Town' quest by getting the town a sheriff or the NCR's troops. When you complete the quest the 'Vikki and Vance Casino' will become open after 3-7 game days. Exchange some Caps for some of the casino's chips and play Blackjack there and 'Save' (don't use auto-save) before every hand so you can just load the game if you lose. You can trade in your chips for caps at the cash register and the NPC will give you the equivalent in caps but will not take away your chips. This trick can be done as many times as you desire.
Added by: Sanzano Oct 26th 2010, ID#15476