Releasing the first Fallout: New Vegas downloadable content as a timed Xbox 360 exclusive earned Bethesda plenty of hate from the PS3 and PC communities. Regardless, the exclusivity window has closed and 'Dead Money' is headed to both platforms before the end of the month, on February 22. We highly recommend setting aside your platform loyalty-fueled bitterness and give the DLC a shot, because it is worth every cent (and then some).
For any other game, we'd assume everyone has already played it through several times this long after launch, but Fallout is an exception to that expectation. 'Dead Money' does require that you go back to a previous save before that point of no return.
Bethesda and Obsidian have also mentioned three more New Vegas add-ons, all of which will be released simultaneously across the three platforms, avoiding much nerd rage.