Ah.. I didn't see you remade this post. I'll just say the jist. For publications that just want to produce something devices can read, focus on the publication and worry about the tech behind it, this product is made for you (works with InDesign, Illustrator, etc):
A multitude of devices and mediums can then read your published content.
With Flash CS5.5+ you can always make a full mobile app from soup to nuts. You'd need to pick your target devices and take it from there. The process of making the e-zine app is different depending on the devices you want to target and while a good portion of the process is the same for all devices, there's no magic button to take the content and make it work on all devices.
Without going the digital publishing suite way which will do all the technical work for you, you're going to need to spruce up on programming, enough to make an app. I haven't done publishing since Quark was the big dog on the block so unfortunately I can't tell you how much of the work Flash and InDesign will do automatically, if any at all. I'm unaware of the level of integration, if any at all. If I were to wager a guess, I'd say you'd only be able to carry over content (images, copy, etc) but you'd need to build your magazine/book app from the ground up to use that content yourself. That's why I recommended the link above. It does that for you and lets you focus on the content.