If you work some of the time on your laptop and some of the time on your desktop box, making sure that your work is updated on both machines is a must. Many tools can help you accomplish this, from command-line tools such as scp and rsync to generic graphical applications like Konqueror or Krusader, to more specific tools like Unison. Komparator and KDiff3, a couple of KDE applications with interesting features, may offer better ways of syncing your work.