I don't know why nobody has suggested this obvious solution, but the Kindle 3 can be made more book-like for less than the cost of the Kindle 1! Simply buy two Kindle 3s, and join them together with parcel tape at the back. Be sure to leave enough room so that they can swing freely and open/close like a book.
Voila! A full two-page view.
When reading, set the left hand reader to even pages, and the right hand reader to odd pages. To turn the page, simply press the page forward buttons on the left and right edges, twice each. One of the reasons that Amazon put the page turn buttons on both sides was probably to facilitate this - they may well issue a double case that supports it in the near future.
To make the experience even more book-like, why not put post-it notes on the back, to give a paper feel? You could also put some under where your nails are, for that scratch and sniff paper smell. Or, simply attach some paper to your face with parcel tape.
If the Kindle is too light or too thin, even with two of them, attach a thin paperback to the back of each using sticky-backed plastic.