Everybody knows de difficulties of managing content when using staging for his website. To tackle that problem I started writing my own sync module and when I created a project page for it on drupal.org, one of the first issues created was stating that the Deploy module was practically the same thing. After checking out the deployment module myself I had to agree with that.
Since I discussed this issue up front with a lot of people and no one even mentioned this module it is clear that this really wanted module is just unknown.
So spread the word and start testing the deploy module.
The deployment framework is a series of modules which are designed to allow developers to easily stage Drupal data from one site to another. This includes content (nodes, taxonomy, users, etc) as well as configuration (views, content types, system settings, etc.) Not only can it push new content, it can also push updates to existing content. Deploy automatically manages dependencies between nodes (IE nodereferences) as well as between other objects. It is designed to have a rich API which can be easily extended to be used in a variety of situations. Check out the screencast for a demo!