This one is going to be off-topic, but you should be expecting the occasional off-topic post by now.
If you use more than one computer, you can appreciate the importance of keeping your files in sync. While some people still try to do this manually with flash drives, most of us have moved up to some sort of Internet-based service. There are plenty of options out there, including a few free ones.
Of the free options I have tried, Dropbox is easily my favorite. Signing up for a free Dropbox account gets you 2GB of online storage. Once you have your account, you can download the Dropbox application to each computer you want to sync. Dropbox will create a folder on each computer, and when you put files in the folder, they will be accessible to each computer on which you have installed Dropbox.
I have Dropbox on 2 PCs at work, a Mac at home, and a laptop. Since I started using it, I never have to worry about remembering to save anything to a flash drive or do any manual syncing. There are even versions that will work on iPhones, iPads, and Android devices.