TabCloud is "a browser tab and session manager which allows you to save groups of open tabs to access later or on another device."
Operative phrase: "on another device." While Chrome (like recent versions of some other browsers) allows you to do things like bookmark all of your open tabs and recall them later, TabCloud allows you to store that list of tabs online, using an account you authenticate with your Google Profile.
Then, later on, you can reload that list of tabs... in the same browser, or in another browser, or even on a completely different computer. (TabCloud works with Chrome and Firefox, and also comes as an Android app.) You just need to be able to authenticate again.
If there's one limitation, it's that you can't publish those collections of tabs so anyone could load them with one click. But this is still a mighty handy tool.
For instance, I can easily imagine having a few suites of tabs that would be useful for presentations, client demos, keynotes or trainings. Being able to load them up anywhere I could get my hands on a copy of Chrome or Firefox (provided I could also install the TabCloud add-on) could be a huge timesaver.
Let me know if you've taken TabCloud for a spin, or if you've come across anything similar (especially if it's useful for the Safari/Internet Explorer crowd).