FFView is a fast OpenGL-powered picture viewer a la ACDsee (2.x).
It is aimed at letting you read manga or other comics onscreen (windowed & fullscreen mode). Features include fast prefetching, smooth panning, voice commands, 2-page mode, a magnifying lens, the ability to browse pictures inside archives (.rar/.cbr, .zip/.cbz/, .pdf) and sticky per-picture options. It reads EXIF tags and is scriptable.
Mac OS X 10.3 or higher.