Well, Brad I wouldn't pay for an Evil Inc app. The reason is that I have the free NetNewsGator RSS app and I've subscribed to your RSS feed in it. That automatically lets me view your comics and updates in a similar way to what you describe for free. Unless you include exclusive content for the iphone app, I don't think I would pay for it.
http://bigsadygilmore.thewebcomic.com Big Sandy Gilmore!