Editor's note: Rob Salkowitz is a business analyst and consultant specializing in the future of entertainment, media and technology. His latest book, "Comic-Con and the Business of Pop Culture" (McGraw-Hill, 2012) focuses on the nerdy audience at the largest comic book trade show in the Western Hemisphere. Follow him @robsalk.

Last year at Comic-Con, digital comics were the headlight approaching in the dark tunnel. This year they are the train bearing down on the industry at full steam. Amid estimates that nearly 30 million Americans now use iPads or tablet devices of some kind, comics and graphic novels have emerged as the killer app for this hot new platform and everyone from the industry’s top publishers to feisty startups and independents are looking for a way to get in on the action.

Against that backdrop, even with all the various entertainment, movie and videogame news pouring out of San Diego this year, it was the announcements coming from digital publishers and platforms that has the greatest potential to shape how we enjoy the stories and characters we love in the months and years to come. Here’s a roundup of some of the top stories in digital from this year’s show: FULL POST