I did some preliminary work on Digital Comic Viewer today. Instead of writing files to disk, I'm able to load them as byte arrays that can be displayed on-screen:
So far this only works with pages that don't have any Flash text layered on them. As I changed things around I ran into a limitation of the excellent SWFToImage library... Although the final image output can be a byte array instead of a file, the SWF input cannot. That's not too surprising, as only crazy people would even have a modified byte array of their SWF to begin with! I sent an email to the SWFToImage author though, so hopefully we can work something out.
Once the basic features are re-implemented without any writes to disk I'll release a preliminary version for people to play with. After that will come a proper full-screen viewing mode, and finally a good user interface.