[davidtgoldblatt]

Rvalue references allow you to "steal" the resources from an object when it's safe to do so. One use for this is to optimize functions returning large complicated data structures, but that's just because memory is a particular type of resource.

With rvalue references, you can move around objects that should be moveable but not copyable. Consider an object representing a database connection - copying it isn't meaningful, but moving it ought to be.