May I followup on this? Your "best practices" suggestion in the Lula LR3 Tutorial regarding upgrading catalogue from LR2 to LR3 begins with the step of "Export Catalogue" from LR2 to accomplish a cruft clean.
In your example, you select your single folder of 54 images and select "Export Catalogue."
QUESTION: If I have multiple folders and nested folders and 71K images in my single catalogue, how do I select all 71K images to prepare for the export? Do I turn off all filters, then click on CATALOGUE / ALL PHOTOGRAPHS, then Select ALL?
The go to "Export Catalogue?"