PDF and eBook is so-so. Don't get me wrong it is very usable-- that is what I mainly use one for now, that and email.
But I am coveting the Kindle I bought my wife for her birthday. It much much much easier to read a book on the Kindle than the n810. There is more screen and the screen so much easier on the eyes. I love that eInk stuff. Just keep it out of the direct sunlight or you have little evil kindles running all over the place. But the little evil kindles are much better than the Vashta Nerada that come in with our hard copy books.