Add ability to browse an MXD's layers from ArcCatalog

Idea created by cstarbird on Aug 5, 2011
    I would love to be able to select an MXD in ArcCatalog and instantly see the layers that are used in the map.  It could function the same way as a folder.  I often want to make sure I use duplicate symbology and layer properties in two different MXDs but this means I have to open the source MXD, copy the layer, and paste it in my destination MXD.  Why can't I just drag the layer out of the MXD?  That would be cool.