There are a number of chess book readers available for the iPhone and iPad, but this is by far the most pleasurable to use, in its well-designed interface and elegant appearance. When you get the free app you also get Capablancas book for free, so you can explore the interface for yourself while reading a classic.
No question, the iPad experience is far superior to the iPhone (you could say much the same for any ebook) but the latter is okay. The catalogue of books is still small but of very high quality. In addition to Capablancas book, I have bought Silmans endgame course and Beims strategy book and they are magnificent. A nice feature is that all puzzles have the solution hidden, but the solution is one touch away.
This app easily merits all five stars, but one tool is surprisingly absent: the ability to add bookmarks, highlights, and marginal notes. I do wonder whether an analysis engine could be embedded into the interface some time in the future.
This is the best chess purchase I have made in a long time, one that has made an immediate difference to my chess understanding. I do hope that chess authors and publishers everywhere will want to make their books available in this format.