Ron Richards at iFanboy takes the most in-depth look yet at Longbox, new software that could become the iTunes for comics. Richards is enthusiastic overall but also points out potential pitfalls, such as getting content from the Big Four publishers. And of course, there is the brick and mortar element:
Now the emergence of a digital comics distribution system is surely to be seen as a threat to Diamond (the main distributor of comics) and local comic book stores. I don’t really have anything to say on that other than that they’re going to need to change or die. I don’t want to be in a world where the local comic store doesn’t exist, and I don’t think that will happen, but the direct market has been a problem (mainly due to Diamond) for years now and the future is inevitable. They’re going to have to evolve their business if they want to survive, it’s just that simple and could be a whole other article so I’ll stop for now.
See also the lengthy comments section, which seems to view the idea of downloadable comics quite positively.