Tablets, led by the iPad, have the potential to shake up the comic-book industry even more than ebook readers have begun to change the world of prose books. Large, portable color screens are perfect for reading comics. They've got a portability that desktop and laptop PCs can't match, and of course they show off the source material in a way that small black-and-white Kindle screens can't.Related StoriesOpinion: Five improvements iBooks Author needs to makeGetting to know iTunes 11's Up Next player
