Remnants of original file structure in library

Question

While most of my photos have been re-arranged in the new library by roll name, when I look in the library via finder, I see that there are still some photos that remain in the original Date named folders.
These photos also now ALL seem to appear under a new roll number that was created automatically during the iPhoto 06 upgrade, regardless of when the said photos were originally created.
All of these photos were at some time modified by photoshop CS.
The question is:
Should/can I delete the remnants of the original file structure from my library (the date named folders, as seen in finder), now that it appears that most everything has been moved from the date based folders to the "Original" and "Modified" folders?

Answer 1

Hey deejaybee - I had the same issue a while back, in my case the new roll (and hence the leftover folders) contained more than 1000 images!
Best advice is don't delete the remnants in the Finder, not until they contain no images at all. Check the images in the new roll within iPhoto, delete them from there if you're sure (which will in turn remove them from the remnant Finder folders), then delete the empty Finder folders.
In iPhoto:
1 Click on the Library in the Source list, opt to Sort by Film Roll and scroll to the new roll created by the upgrade.
2 Check each image in the new roll against where it should be in your Library. Prior to the v6 upgrade, each of these photos originally existed in another, earlier, roll (created when you first imported them) and those original rolls will now contain either duplicates of the photos in the new roll, 'original' pre-edit versions of the photos in the new roll or - more worryingly - no copy of the photos at all. If you can't quickly locate the original roll:
a Select a photo in the new roll and click the 'i' button in the bottom left corner of the iPhoto window to show you the date the photo was taken;
b Click the calendar button (to the right of the 'i' button) and select the exact date you just found;
c If you're still in Library / Film Roll view, you'll now see just the rolls containing photos from that date; the selected photo should originally have existed in one of these and others from the same shoot should still be there.
In your case you say all the photos in the new roll had at some point been modified in Photoshop; what you should be looking out for then is the 'original' copies of those photos, if you keep / kept them (so you can always 'Revert to Original' if you don't like your edits). If not the originals then at the very least ensure that those new roll photos still exist in the original roll(s) in their edited form.
If you can't locate the photos in the original roll(s) at all, and you wish to keep them, don't delete the copies in the new roll! Either leave them in the new roll or, in full Library / roll view (i.e. with the calendar button not selected) select & drag them from the new roll to the roll they were originally in.
As an example, in my case many of the photos in the new roll were unedited 'originals'. The edited versions of these still existed where they should have in their original rolls, and for these edited versions the 'Revert to Original' menu option was still available, but selecting it did nothing - because the original photos had somehow become orphaned, hence iPhoto moving them to the new roll, to draw the to my attention. I dragged the originals back to the correct rolls and deleted the edited versions - I can always recreate edits from an original photo, but I can never recreate the original photo once it's gone.
Once you've emptied the new roll completely, by either dragging the photos back to another roll or by simply deleting them, the remnant Finder folders will also be empty and can then safely be deleted.
Hope this doesn't sound all too pedantic; out of my 1000+ photos, a large proportion of them were not to be found elsewhere in my Library and I would have lost rather a lot by simply deleting them without consideration...