I've always wanted to see a book that describes git for the common man and gives them tons of examples for how to use it to do productive things.
Even for a small office, git can be immensely useful. Entire production line workflows can be implemented with git .. if only folks would learn to use it productively.
Its not just for development. Writers can use it productively. Accountants too.
It always kind of irks me that Git hasn't just been folded into the OS front-end UI by any of the OS vendors .. it'd be so revolutionary to give common folks an easy way to manage the timeline/history of their computer use using git.