Windows/Mac: CupCloud makes it easy to save and stop your work on one computer and pick right up where you left off on another. You can also save your session so you can reboot your computer and get back to work without opening your tabs or applications again.
CupCloud is in public beta right now, but it works like a charm. Just keep CupCloud running in the background on your Windows PC or Mac, and when you need to save your computer's session, just bring up the window and click "Cup" to save your system's current state — that includes open browser windows, open documents, files, and Explorer or Finder windows. Then, when you sit down at your other computer, you can click "uncup" to automatically open the programs you were working in, tabs you were reading, documents you were editing and so on. It's quick and easy — and you don't have to leave everything open on the other computer for it to work.
Similarly, the app is useful if you suddenly have to reboot, such as after a new application installation or because your IT department just pushed new updates to your computer. Just Cup your current session, reboot, Uncup it and you're back to work. You can even share those "cups" or saved sessions, with others so you can work together.
CupCloud isn't perfect — right now it only supports popular web browsers, Microsoft Office, Apple iWork, Finder, Explorer and Acrobat — but more applications are coming soon as the beta progresses. You'll still have to remember to re-open your IM client, for example, or your favourite Twitter app. However, the service is completely free and very useful. Hit the link below to see how it works and to sign up.