We've posted about Comixology's domination of comic book content on iOS before -- it's certainly not the only app that lets you read and even buy comic books, but it's by far the most popular, and keeps getting even more so. The company has just announced that it's reached 65 million downloads across the platform as a whole, which is just a huge amount of content delivered. And Comixology keeps locking down plans to deliver even more -- their latest deal is with Marvel, and allows Comixology to exclusively re