Since this is to go against the designs of Amazon AND Apple, both of which want to hold your book captive and keep you from using them as you wish, it's unlikely that you can read them on the N810.

If there was a way to do it, I think it would be so clunky that it wouldn't be worth it -- for example, if you could broadcast a picture of the iPhone and read the iPhone's screen... yuck, there would be zillions of problems.