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Zen seems to have problems theming Drupal's standard site maintenance page (aka site offline page). The page is enabled/disabled at Administer > Site configuration > Site maintenance.
When I tell Drupal to use Zen as the theme for the site maintenance page, (as described at http://drupal.org/node/195435), that page does get the Zen theme, but the layout isn't right. The page title and content is displayed at the top of the screen, adjacent to the right side of the site logo, and the text doesn't wrap normally, so it produces a horizontal scroll bar.