Have you ever wanted copy a node to the same parent in the quickest way possible? This data type will create a button and allow you to make X copies of a node and will place them under the same parent as the source document. You can also configure it to publish and relate the copied items.
This is especially useful when a parent node is set to show its children in a list because in this case the children nodes don't show up in the tree so making copies is hard.
Just add the Copy Here datatype to your master document type (or any that you might want to make mass copies) and the button will show up.
This is very useful when you want to create a lot of nodes for testing.
For now you'll need to touch the web.config after installation.
Version 7.x only.