I've been kicking around the HTMLDOC product from ESP and I'm pretty impressed with it so far.
It really understands going from HTML to an ebook. Plus the "Universal" page size fits very nicely on the iLiad's screen.
http://www.easysw.com/htmldoc/
I've also been very impressed with its Table of Contents that it provides for each document. It has made navigating multi-thousand page documents much better on the iLiad (on 2.6.1 where links work again.)
The font selection is a little limited but if you've got some HTML you want to read on the iLiad I believe the results are far superior to using minimo on the iLiad, and you certainly don't have to sweat all the HTML tagging and manifest.xml generation pain.
I suspect that it would do a nice job on comic books, so long as you can throw an HTML shell around the images...
21 day demo license, $69 for a full license. Or if you want, some form of it is available as open source.