The idea of a large format ebook reader is nice, but alas, it is not for me.
For me, ebook readers satisfy two needs:
1) They store lots of books at once.
2) They're portable.
I'm handicapped, and use a wheelchair. Anything much bigger than an iLiad or a Kindle and it wouldn't be portable enough for me, I think. Luckily, my first ebooks were read on Palms, so the Kindle seems like a widescreen TV to me, by comparison.