I'm working on a project with a collaborator who doesn't use Unity and doesn't really have an interest in game development (gasp) but it is still important that she can add/edit item data for the game. From a practical workflow perspective, I probably would've kept the item data separate from the game code anyway, to make it easier to balance and tweak stuff. This is usually the stage at which you'd make your own level editor or game database editor or something, but maybe there's a better way -- we can just tell Unity to read from a public Google Docs spreadsheet and parse the data. That way, anyone can edit the game levels or localization strings or whatever from anywhere in the world, and the game client will update data seamlessly.
A lot of this post comes from Clark Kromenaker's great post on accessing Google Docs services with C#, and a lot of my setup process is the same as his.
However, my particular project didn't need any data kept private, the game itself didn't need write access to the documents, and authentication looked like a pain (e.g. using OAuth 2.0 requires you to open a browser window so the user can okay the permissions? Yeah, no thanks) so I worked out how to access read-only publicly published Google Drive spreadsheets without any logins or anything.