Select All Raster: Links Panel >> Highlight all links >> Click on go to link button
Select All Vector: Select >> Inverse
These usually aren't links, but embedded graphics or in most cases, slices and elements from transparency flattening in ads submitted by clients and agencies.
We use CS 5.1.
The plug-in sounds promising. I'll give that a try.
Works with embedded also, as they show up in the links panel.