We use git at Bump for all sorts of things. Recently, we've started converting our designers and product managers. You can think about git like Dropbox: it takes files on your computer, puts them in the cloud, and lets other people work on them too. But it has some pretty rocking advantages:
Like Dropbox, git lets multiple people work on the same files at the same time. This is great when many people are working on a document together, or a group of people are creating assets for a website. Everyone can be contributing to the same folder and files, without fear of overwriting eachother's work, something Dropbox can scew up.