Apart from contacts and files, what other kind of data is worth synchronizing?

[sgarbi]

I believe there is value in syncronization.

Do you see any particular unexplored field where we still lack such a treat?

[andrew_gardener]

development environments? Though it might fall into file sync, its non trivial at the moment

[swanson → andrew_gardener]

You can see plenty of examples of this on GitHub, where people post their dotfiles as a repo, so that you can clone the repo on a new machine and your shell/editor/OS will be configured how you like it.

[andrewcooke]

passwords