I don't think this will be a problem for those of us that manage our own libraries. I have an iPhoto file that is about 1gb (which contains all the iphoto specific changes) and 20gb of pictures saved in actual folders that I've been carrying over for years. Upgrading iPhoto will prob change the 1gb file, but leave all the others alone....at least that's my guess. I won't know for sure until my upgrade disc comes in the mail.
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