I recently got a
Book Seat and I'm loving it. It's sort of a cushion crossed with a lectern, and my 505 fits perfectly in the suede "seat." The optional page holder works pretty well for holding the 505's cover open, though I guess it would be even better to simply take the cover off.
With a couple couch pillows on my lap and the Book Seat on top of that, the reader is just about at eye level, and this make a noticeable difference in comfort. I'm no longer getting a crick in my neck from staring at my lap and my hands don't get tired from holding the 505. Sounds lazy but after an hour or two it can get on your nerves!
Now if I could just get a remote control so that I don't even have to lift my arm to hit the page turn button...