Then segregating by systems is a better option (and the one I choose for persistent personal data other than Web profiles or email). Of course, there's also an

Then segregating by systems is a better option (and the one I choose for persistent personal data other than Web profiles or email). Of course, there's also an opportunity here for Dropbox or a competitor to offer something better. I expect there's a non-negligible demand for the ability to sync multiple accounts to different directory sets on a single client. So, maybe it's a feature that could be offered only to paying customers, to allow them to more easily separate their personal and business accounts.