When I first set out on building this site, I'd resolved that I'd go with a native Drupal solution. But I kept running into the same problems: Any given solution had most of the features that I wanted, but was missing a few. The one that came closest to a complete solution was Acidfree, but near as I can tell it's currently unsupported, and the dev release hasn't been updated in over a year.
So I went with Menalto Gallery.
