The best way to do this is to keep everything in its original folder, but use "albums" and "smart albums" in iPhoto.
So, you have a big folder named "Scrapbooking," for example. Inside that, you have each folder (DD stuff conveniently comes in a folder prefaced with the designer name and the title). You don't move stuff around to organize it-- you do that in by cataloging it in iPhoto.
After you import everything to iPhoto, set up the albums you want to find the stuff. You can add keywords to your stuff and use that to set up smart albums, or you can just make dumb albums the hard way.
Once you relax and let the iPhoto catalog do the work, you can enjoy scrapping instead of spending all your time organizing. Trust me on this.
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--Lynn
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