You may have seen that Barnes & Nobel released a new tablet this year. As usual, their tablet is fantastic, full of features, and doomed to be completely overshadowed by the Kindle Fire HD. At least they're not the Kobo ARC. If you're not in Canada, you probably haven't heard of Kobo.
I've always had a soft spot for the Nook reading app. I like the page turning action, and I think it's pretty readable. The Kindle app just isn't as easy to read, but they don't have to be if your library is already there. Nook is the Avis of eReaders. They try harder.