Well i dont have many friends who play Fallout NV,but im Looking for someone to play with.I have a skype and teamspeak but i dont have a mic,but you can talk.Ill tell you the list of mods im playing with!

There's actually a co-op mod?

Never heard of it. Link?

I never heard of one that is actually in a working state.

Maybe the OP is talking about just having someone to talk to while playing the game.