Panelfly
Not content to let traditional books have all the digital distribution fun, Panelfly (Free; App Store Link) lets you purchase, download, and read digital comics right from your iPhone or iPod touch. With hundreds of titles available from some of the biggest names in comics — including Marvel — Panelfly's slick, well-designed interface makes reading each issue as easy as possible, and in case you're thinking the iPhone/iPod touch screen is too small, have patience — Panelfly for the iPad will launch alongside the device in March.