I really don't like Microsoft (no, it's not a Mac/PC fangirl thing, I'm just tired of their stuff not working) (ok, maybe it is a Mac/PC fangirl thing), but their upcoming Courier "digital journal" looks really amazing. It could be very disappointing, but it looks like I've always thought e-book should and opens like -gasp!- a book.
That doesn't mean I don't want an iPad any more (boy do I ever). Of course, it'll be a loooong time before I can afford either one, so I guess it's moot.
Addendum: Maybe the reason I like is that it looks like an iPad that folds closed like a book . . .