Currently on the site we have 32 questions tagged under cataclysm and 11 questions tagged under expansions. Similarly, with DLC, we have some questions for Fallout:NV:Dead Money tagged as fallout-new-vegas + dead-money and others tagged as fallout-new-vegas + dlc. One uses the specific name of the expansion or DLC whereas the other uses the much more general categorization tag.
Since we have relatively few of these at the moment, but presumably many more on the way in 2012 with the release of the Starcraft expansion Heart of The Swarm, I figure now would be a good time to unite these questions under one tagging convention.
How should we tag questions involving game expansions or expansion-ish DLC?