We have a lot of computers in our shop, and we often have to share files like printing labels, or forms, or firmware to burn into chips. We used to use USB keys or email but would often have mixups and old revisions kicking around. Now we use dropbox, which is a very easy to use folder-syncing service. Install it on two (or more) computers and they can 'share' a folder. All the important files that are shared between computers stay in there.
Combining dropbox with github, you can have a very nice development system!