I find a couple of decent glitches the other day while exploring. Once you have done the "Wang Dang Atomic Tango" quest where you find some new "talent" for the Atomic wrangler. When you go talk to Fisto, you have two options:

"I would like to purchase your services"

Or

"Maybe Later"

Select "Maybe later" and it will close dialog and Fisto will give you 10 caps. Repeat infinitely.

*All quotes are from memory and probably not right* Sorry

Also, when I went to Camp Guardian after picking up the CZ57 Avenger, there is a guy in the cave with a few Lakelurk Kings. If you talk him into helping you clear the cave (not sure if it works without talking him into it) he says he will give you his gun. When you get done he says he is going to leave and you have the option of mentioning his promise. Select that response and he will give you his service rifle and a few 5.56 rounds. You can repeat this as many times as you want. This glitch is one of the more popular ones, as I noticed when I looked it up online to see if others were having the same issue.

for some reason the fisto one never worked with me.if you talk to manny in novac about benny before talkin to dep beagle in primm about benny he cant give you the info about him so ya can keep on askin as long as you want.ive been usin this to get to lvl 30 before doin any missions.pretty cool doin goodsprings quest tooled up to the eyeballs and usin all the best guns on the game + i made a huge minefield on the road so they never got close.imagine its raining powder gangers and your there