If you have bad karma (or don't mind having even worse karma), head over to Paradise
Falls, a place a group of evil slavers call home. To gain entrance without having to open
fire, you have to be friendly with the slavers, which will give you an evil slant. But if
you can do this, you'll find a guy endlessly walking around the settlement (he's usually
at or near the bar, but can be elsewhere). When you get near him, he'll stop you
automatically, tell you he found some cool stuff on a recent raid, and give you some of
what he got (it will be either some ammunition, Bottle Caps, or various aid items). After
your first encounter, all you have to do is keep speaking to him to earn more and more
free stuff.

To try this, you'll need to have the Mister Sandman perk activated, which will mean you
have to be at least at level ten. You'll also need a sneak skill of at least 60. If that
fits your character, then travel to Andale. Andale is full of kids that can't be killed
(killing kids in Fallout 3 is an impossibility). During nighttime, when everyone in Andale
is sleeping, break into various houses and kill the kids while sleeping using the Mister
Sandman perk. They won't die, but you'll still be rewarded experience for having killed
them. You can then repeat the process over and over again for infinite experience points.

The game's five Super Mutant Behemoths can be found at the following five locations:
Evergreen Mills, Galaxy News Radio, Jury Station, Takoma Industrial, and The Capitol
Building.

In the Publishing wing of Hubris Comics, some terminals will allow you to play a
text-based adventure (ala Zork: The Great Underground Empire) called Reign of Grelok
(beta).  The objective of this game is to kill Grelok, for which there is no physical
reward.  Study up on your text-based adventures before venturing out on your quest: Use
the commands N S E W for directions, and use basic terms to speak to people.  Don't forget
to swear!

Note: this cheat only applies to the Operation Anchorage downloadable content pack.  As
soon as you are able to control your own strike team, you'll be able to get specific
weapon loadouts from a terminal.  If you give these to the Quartermaster, you can go get
another loadout.  Drop all the new stuff and talk to the Quartermaster.  He'll give you
your stuff sans ammo.  That's no problem though, since you can head to the ammo dispenser
for more.  Pick up the weapons on the ground when you're ready to go, or repeat for all
the weapons you can handle.

Here's a glitch that will allow you to get infinite amounts of experience (as long as your
Speech skill is high enough). Try the following steps:

1.) - Go to Big Town and find the NPC named Pappy.

2.) - Select the dialogue choice “You came here with Bittercup, right?”
If this dialogue choice doesn't show up, find Bittercup, exhaust all of her conversation
chains, and then try speaking with Pappy again. ([Speech 100%] should appear next to the
dialogue choice if your Speech skill is at its highest. If it's not there yet, don't risk
trying to convince him. Speech failure will result in this glitch permanently
disappearing.)

3.) - Selecting that dialogue option successfully will net you six experience
points. Speak to him again and you can get the experience again. Repeat as much as you
want for as much experience as you want.