I bought a book, awhile ago, that I thought I'd use a lot, that I'd work out of a lot, that I'd try to keep open while following the instructions and doing the techniques within its pages. Let's call that kind of book an "art workbook". So, I went to Kinko's and had them shave off the spine and re-bind with a coil binding.
I can fold the pages back. And when open it stays flat.