PanelFly is not only a free application (although naturally every cmic we buy has its price), it is a complete platform to buy, manage and read our library of comic books and graphic novels.
The bad news is that The application is only available for the App Store in the United States, probably because of the problems that the licenses of the cmics can cause. Anyway, seeing the interface of the viewer of cmics on the iPad, we can be the first of a series of iComics Store. Time will tell if this type of stores will have, together with the iBooks Store, a decent success.
The developers of this application have already earned very good scores from those who have left reviews on iTunes, and so it seems the developers have done their homework and have promised a version of Panelfly optimized for the iPad as soon as Apple's new device goes on the market.