Unfortunately the photo gallery previews all of the images in any of the folders on your NC. Therefore I've only been transferring a few books at a time via calbre and then manually deleting the cover art before I disconnect the USB. You don't need the cover art *.jpgs in order for the covers to show on the NC. The other option is to drag-and-drop individual books from your calibre library folders to the NC Books folder rather than to use calibre's "Send to Device" option. Again, not a good option if you have a large library.
Also I don't believe anybody has figured out yet how to delete the stock photos from the gallery either. There is a delete option. However, the next time you cycle the power off / on to your NC it will restore what has been deleted. It seems to be a bug of some sort. It's annoying. I like to be organized too, and I just want to see my photos.
My post sounds a bit negative. Really the NC is a great device! I am thoroughly enjoying it, and I think your wife will be very happy with her gift. Merry Christmas!
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