Dropbox is a handy service to automatically synchronize files between different computers.  Each computer requires a client that connects to the service and monitors the dropbox folder for changes.  It's free for up to 2GB of storage and works well.

One of the cool things about Dropbox, is that they provide a native linux client but it integrates with the Gnome desktop environment.  While you can get it working, its a bit of a hassle.  However, I just found a KDE application that works with it, named KFilebox, formerly known as KDropbox. To install, you can grab the .deb or .rpm file and follow the instructions.  If you use ArchLinux, its available on AUR.