When organizing albums in a "sub-album" layout, the
user interface does not make much sense.
For example, parent albums could be created for
grouping. Those parent albums could then have multiple
sub-albums, with no images in the actual parent album.
The way nGallery works right now, even if there are no
images in the parent album, the sub-albums are always
crammed to the right of the screen, leaving a large
empty space in the middle.
I would consider moving the sub-albums so they are
shown integrated with the actual photos, similar to how
Windows Explorer works with folders and files.