Television shows have something called a http://en.wikipedia.org/wiki/Bible_%28writing%29. It's a reference document that is used to ensure http://tvtropes.org/pmwiki/pmwiki.php/Main/Continuity within a series. (Not that the continuity doesn't a tendency to get [censored] anyway).
Another good example is the Fallout Bible (Google it.).
It would be great if someone made a TES Bible.
An even better example is the http://5years.doomworld.com/doombible/.
Just an example:
You are a soldier in the UAAF (United Aerospace Armed Forces) assigned to the secondary military research base on the darkside of the giant moon Tei Tenga (nicknamed "the Butt End of Space"). You and four friends are having a game of cards in the hangar bay. One of your friends leaves to go on shift.
In the game, you're a Space Marine acting on behalf of the UAC (Union Aerospace Corporation), intervening in laboratories on the dwarf moons of Mars, Phobos and Deimos.
Everything else is like that. Video game bible = development garbage. Does it exist for TES? You bet! Where do you think http://www.imperial-library.info/maps/concept_morrowind.jpg and http://www.imperial-library.info/maps/vvardenfell_map.jpg come from?
Did you know the Fallout bible is not canon? Yup, it isn't!