Are there any plans to add any form of login or device pair support to the API? I'd love to help create apps and all, but the lack of accessing a users purchases/"inventory" definitely makes it harder.
I doubt it. The API was more for back when we you didn't really need to auth to read things. As such you could make apps and the sort. That isn't to say that you can't still make apps and what not(I believe my script thing still works for what it was meant to do). But as far as allowing OAuth I don't think it'll happen. The site has a mobile version as well as mobile reader for content. It just seems like extra not needed work.