I had pretty much the same idea some time ago. I wanted e-readers as wall mounted interfaces, because they are cheap, always ON and have very sharp image quality. Latest Nook devices seem good on paper - they have Android and web browser, they are touch and have relatively good hardware for a reader. But, the e-ink display seems just not to be ready for this. Although there are some hacks for fast display refresh (
http://www.youtube.com/watch?v=kBbl6egyPsQ), this stays an e-ink display. The browser UX is far from decent and probably that's why Nook decided to remove the browser few weeks after the release. But I've never tested myself e.g. GreenT with a Nook rooted device and Chrome. So, if you decide going to that route, please share your tests. It's very interesting subject, I think :)