How to copy paste layers from one QGIS project to another?

Using QGIS 2.4, how can I copy one or more layers (with its properties, style, and the path of the source data) on QGIS and paste it in a different .QGS project?

I tried to make this, clicking in a layer and drag and drop in the Layers window of another .qgs project but don't take the properties of the first layer.

Answer

There is a plugin named Layers menu from project that lets you import layers from other project files incuding the styling.

The only pitfall: Attention : the project must be configured to record absolute paths which is not the default for QGIS. But you can change it in the project properties.