I've written about Decoupled Content Management before. As the Symfony Live event in Paris is nearing, I thought to give Symfony CMF a spin. Symfony CMF is a new approach at building PHP content management systems, and adheres quite well to the principles of decoupled CMS.
He helps you set up the needed dependencies and content schemas as well as the YML configuration you'll need to set up to get the content repository backend working and integrated. Some command line calls are included to "prime" the database and the application should be ready to go.