Fallout: New Vegas mod Fallout: The Frontier will be getting a Steam release.
More information.
Fallout: The Frontier is a gigantic DLC/New Game . It's a FREE mod for the PC game : Fallout new Vegas by Obsidian Entertainment, made by a group of passionate on their free time during 6 years.
Story: As the "Courier" (Your character in FNV) you start a new adventure centered around a conflict between the NCR and the Legion in the snow blasted remains of Portland Oregon. Featuring 3 major questlines, 50+ side quests, hundreds of new armours, weapons and items, and thousands of lines of voiced dialogue.