If your library of digital comics has grown unwieldy, Comic Zeal can help clean up the mess. The app arranges and displays titles by series, with large thumbnails of the covers, making it easy to locate your vintage Spider-Man #300 at a moment's notice.
WIRED Imports files via iTunes or wirelessly with Comic Zeal's desktop app. Works with .cbz and .cbr file formats, as well as .zip, .rar, and .pdf. Uses familiar multitouch gestures for reading.
TIRED Overkill unless you're a die-hard collector. Pricey.