Our company creates technical manuals consisting of five chapters, all named the same, except with a different prefix. For example the "ABC Widget" manual has an introduction chapter named "ABC 1 - Introduction", a safety chapter named "ABC 2 - Safety", etc. Many times I re-use documents for creating subsequent manuals using the "Save As" command. So the "ABC 1 - Introduction" chapter would be saved as "EFG 1 - Introduction" for the "EFG Widget" book. For all the internal xrefs it saves a whole lot of time since all of the xrefs are preserved. But for cross-document references it creates a problem. For example, if the "ABC 1 - Introduction" chapter has a xref to "ABC 2 - Safety", when I save the Introduction chapter as "EFG 1 - Introduction" it will still retain the xref to "ABC 2 - Safety".
Right now, the only way to see if there are xrefs pointing to latent docs, is to check each one manually. If the xref panel displayed a column indicating the filename of the linked documents, I would be able to tell at a glance if that xref was pointing to the wrong document.
ID CS5, MAC