The second edition of Programming Ruby is now available for pre-order. The first edition was easily my favorite Ruby book, but it’s a bit dated now. The second edition covers Ruby 1.8.2, and includes an extra couple hundred pages of reference material.
In addition to the printed version (available via Amazon, etc), they’re also selling PDF copies of the book. If you order them together, then you pay $10 extra for the PDF, which seems really reasonable to me. I’d much rather search through the PDF then deal with the index of a printed book. I’d like to see other programming books sold with the same model.