Some games like the Spoils provide very little outside materials about the world it's set in. I found about 2 articles from @patrick and some comics. On the other hand designer of Genesis: Battle of champions provides few short stories and descriptions on his web page. For me personally, I wasn't that interested in The spoils world when the game was still alive, but some time after fall I was trying to find as many resources as I can and I've got really interested. I wonder how much worldbuilding is important for You guys? Do You like to read external resources, or simply enjoy the game mechanics?
@cryptogogue_ken have you thought about this in regards to volition? Will there be any additional resources people can consume or is it intended to be driven only by the community? And if so, will there be a place for players stories?