Comix is an image viewer specifically designed to handle comic books. It reads ZIP, RAR and tar archives (also gzip or bzip2 compressed), as well as plain image files. It has a simple and user-friendly GUI using PyGTK.
Comix 2.5 introduces a mouse controlled magnifying lens that can be used to zoom in on parts of the images. Other changes include adjustable sizes for the thumbnails, small thumbnails for the bookmarks and some bugfixes.
Read more at http://comix.sourceforge.net