Of course this game isn't complete without the
Nude Ray 5000.
Saying it's NSFW is redundant, I think. Also you need an account to see/download it.
Disclaimer: Nudity not included. Get your own plugin for that.
EDIT: I'm going to start a new game. I think I'll ignore the main quest completely and experiment with "must havey" mods. Checking the Nexus, I found this:
The Strip OpenNew Vegas Strip OverhaulNow what do these do? Well, not tested them yet, but the first one removes the stupid barriers between pieces of The Strip. I mean, what the heck? The Strip was supposed to be some sort of trip into memory lane of the real Las Vegas, you know, a long avenue or whatever. Instead, we get 3 smallish-rooms. Freeside looks way more citicey than the Strip, with intersections and whatnot. So anyway, if you want a better experience and some risk of bugs, install The Strip Open.
The second one apparently makes it more Stripy. Like, adds palm trees or something, not sure. Something about Bethesda lying to us with their preview videos during Beta. It requires the first mod, so it doesn't remove the strip transitions by itself.
Check it out here:
http://www.youtube.com/watch?v=gc_F35Iczdg.
Fellout NVFriend of the Night for FelloutApparently, there's this game called Physics, which includes a nifty plugin named Gravity, that makes stuff that's up in the air not be there for undefined lengths of time. So, stuff like fallout (the stuff, not Black Isle/Bethesda's game of the same name) shouldn't be floating around for 200 years... ok, the point is, this removes that ugly tint in the sky and makes it more normal, less glowy, etc. A side effect is that the night without a light source is really pitch black...
Here enters the second mod. Seems like there's a perk that should let you see a bit in the dark (not like you have neon lights for eyebrows, but still), and removing the sky tint breaks that, so this mod fixes it. Or something. (BTW, the Fellout mod has a version of the FotN plugin in its files section. There's also a plugin that changes some of the grass to green. To quote "If there's dead grass everywhere, surely there has to be live grass or there'd be no grass. This adds both.").
Gonna test all these this time around.
If anyone knows of a mod that disables the main storyline it would be great. For now I'm interested in a sandboxey experience.