Thanks a lot Rebby!!
Indeed I was imagining having multiple libraries as well, and my question was about the ability to move photos/movies around between them. Can you tell me a bit more about the process of moving photos/movies around? Let's say for simplification that I have one library on the external drive and one on the Macbook, can I simply drag and drop the photos within Aperture?
You make me worried that I can not do this when you write that "I'd really love it if Aperture supported a "fragmented library" framework (by being able to open/work with all 5 libraries at once and drag/drop between them) but, alas, that's not the case. At least not today."
If you can NOT drag/drop, how else do you move files around?
Thanks again..