dss: Thank you! Those are good ideas.
1. I will think about how to go about doing this. Rather than offer it as an initial gallery preview, I plan to have this set of thumbnails (stylishly laid out of course) that point back to the corresponding pictures from the archives.
But the whole plan was "keep it simpler than insanely simple", so I need to work on having these elements and not have them apparent on the main page.
2. That "sort of" exists. Right now all the pictures are under the default category, "general", but when I upload the pictures when the site is up for real, I will classify them into different categories, so just loading something like http://delineate.wahgnube.org/?cat=1 should work (though it is moderately broken now). I will need to refine that. But the users can't really sort it, not yet anyway. I will need to do some work to get that sort of functionality.
(By the way, the reason I called the archives "shoebox" was to make it seem like a random collection of unclassified photos in an old box. :))