I bought a Sony (some small thing with buttons on the side) eBook reader a few weeks ago for straight book reading, but then felt the urge to read some comics on the thing.
Converting CBR to PDF (or Word) was kind of a pain. CBRs are scanned and sometimes the contrast isn't very good so they're hard to read. In addition, page borders and margins make the images smaller than they need to be.
For that reason I wrote a program to convert CBR in to EPUB, and it processes the images so that they look better on an eBook reader. It's all automatic.
It's open source and totally free. If anyone wants it you can find it here:
http://sourceforge.net/projects/comictoepub/
Will