Drop it, share it, sync it, save it
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.
There's a free version that's space limited and the option to upgrade. We use two free ones for the office - one for online quickbooks backup
and one for sharing files between computers. Then we have a paid one for personal computer backups. The only thing we wish was improved is the ability to have multiple dropboxes on one computer. There's ways to do it but it's not built in.
Combining dropbox with github, you can have a very nice development system!