I'm not sure what to think of the Bookrest. It seems better than keeping a book folded open on a table, which really mauls the spine, but I think a thick book would fall off this if you happened to pause your reading at any place other than halfway through. Also, metal things sticking out the wall seem like an invitation to accidentally bash into them. Maybe that's just me.
You can read more about it — and order one for $29 — here.