I'm afraid I'm coming rather late to the party - several weeks of marking etc., have meant that I've only skimmed the odd post!
What I haven't seen, though it's entirely possible it was in posts I skimmed way too fast - is a distinction between the different types of experience you look for in a book
To me; I look in novels for escapism; to draw my own pictures of what the characters look like ... essentially, I guess, I want the book to control me. So, for that, my Kindle is fab. It won't play me scary music if it thinks the plot merits it; it doesn't encourage me to annotate (I can if I'm really desperate); the battery life is awesome - I can read it in the sun (though not under the covers without a torch!) etc.
On the other hand, non-fiction; I like additional media to help me understand, etc; I want to control it. So, from that point of view; iPads/phones/laptops / even my OLPC is great; I can have the interaction with it that I want, I can read it under the covers (not sure I'd want to for a non-fiction book mind!) - even if not as well in the sun (unless it's the OLPC with its backlit or e-ink screen) - though the battery life isn't as good.
I did see on thread discussing what to call 'ebooks' (the software) - and presumably the hardware - does eReader apply to them all, (or is that predominantly what I see as my first option) - and, should there be a different name for the two different types.
Hope that makes sense; now off to read the posts from the new seminar, so as not to get too far behind!