First and foremost I would like a nice patch to get rid of all the PS3 glitches. I don't want to hear that I should play it on the PC to enjoy FNV fully, because I should be able to enjoy it fully on my PS3.
As for DLC...
1. A stove that works like the fire pits, so I don't have to haul all my stuff from my hotel room at the Lucky 38 somewhere else in order to cook stuff.
2. I would like to be able to put a reloading bench in my hotel room
3. I would like to be able to redecorate my hotel room or some other new dwelling that they could add to the game.
I like perilisk's ideas. {{My recommendation: A DLC based around an Art Bell-style radio station, mainly focused on UFOs, wanamingos, Area 51, conspiracy theories, etc.}}...they sound much more exciting than the main storyline of FNV
That's it for now.