I was really surprised by how much I enjoy Marvel's iPhone app. I was concerned that the small screen size would detract from the experience, but they managed to make it into an asset by carefully scripting the transition from panel to panel. In particularly large panels with important details, they start zoomed in on the detail and then pan out to reveal the full frame.
Wow. I've been waiting for a way to buy some Vertigo comics since I bought my iPad. I'm thrilled that they decided to go with Comixology (makers of the Marvel iPhone app). I'm going to grab the first copy of Neil Gaiman’s Sandman as soon as I get home tonight!
Interesting. I thought only Apple could sell digital content in apps on their platform. That's why Amazon doesn't let you buy books directly from the Kindle app. Has it changed recently?
Apple introduced in-app purchasing with iOS version 3 (if memory serves). So this sort of thing has been possible for about a year. Not sure why Amazon hasn't taken advantage of this.