Radical Breeze has released RadicalCodex
(http://www.radicalbreeze.com/radicalcodexwin.shtml), an US$25 Mac OS
X app for collecting and reading digital comic books. It supports the
most popular eComic file formats (including CBR and CBZ), and sports
advanced reading and organizing features.

RadicalCodex provides a customizable interface for reading comic
books, automatic bookmarking, and bookmark lists. You can view and
search through your books with a customizable cover view, then
organize your books into definable collections. You can even set a
Comic Book page as your desktop background.

Purchasing the Mac OS X version grants you the right to use both the
Windows and Linux versions of RadicalCodex, as well.