Thanks to my partner for this link to an article in the Guardian.
I don't intend to join the discussion about paper books over ebooks right now (I use both for different purposes, and when researching like to have both - a paper copy for the bus or bath, foxed corners and pencil notes, and a PDF for searching quickly).
The Open Library.
And although I don't perform any more, I still love magic (my childhood hobby, part of my mid-life performing career, and now my equivalent to The Times Crossword, for mental stimulation) - so some people might find the attempt to digitalize all available (out of copyright) magic books interesting as a project.
Check out Chris Wasshuber's extraordinary Lybrary website, for books on magic, gambling, gaming, confidence tricks, etc. Coming up to a tenth anniversary...