Tom wrote and asked:
"You know how when packaging in InDesign, each package comes in its own folder? What if I have 25 versions of a project, all using same elements. Is there a way to package them into one folder, so that the links end up all in one folder for all documents? Or do I have to just merge the Links folders?"
InDesign's Package feature (File > Package) is invaluable for moving a copy of an InDesign file and all of its placed and linked graphics into a single folder. But when you find yourself in the situation that Tom describes, you'll want to take advantage of this little trick:
1. Choose File > New > Book, and give the new temporary Book file you've created a name and location.
2. An empty Book panel will appear on your screen. Drag each of the InDesign files that you want to package into the book panel to add them to the Book file list.
3. Make sure that none of the InDesign files in the Book list are selected, and then choose Package Book for Print from the Book panel menu. InDesign will create a new folder, create a copy of each of the InDesign files in this folder, and then create one Links folder. All the graphics from all the InDesign files will go in this common Links folder.
NOTE: If two of the InDesign files use a graphic with the same name but from different original folders, the graphics will be dynamically renamed and relinked by having a numeral appended to the end of the filename. If two InDesign files use the same graphic from the same original location, the graphic will only be copied to the new Links folder once. This is exactly the behavior that I'd expect.