Those still interested in iComic can find plugins and discussion here:

http://groups.yahoo.com/group/iComic_group/

iComic is open source and the source code can be found here:

http://sourceforge.net/projects/icomic/

If you are a developer please consider picking up it's development (no development has been done for nearly 5 years) and restore it to the great app it was intended to be. Please post your progress in the Yahoo discussion group.

(I'm not the original developer, just someone who loves iComic)