I've been using BookShelf but am really not very happy with it. Its easy to transfer text files over, but it can't read pdfs which is a major negative, and it can only load a few paragraphs at a time. The bookmark feature is also buggy. I saw DataCase while browsing today's app releases and it seems interested and has fantastic reviews. Has anyone used it so far, and how is it as an ebook reader? can it make bookmarks? Does anyone else have other recommendations for an ebook reader? I also have no interest in buying ebooks and just want to use the pdfs and text files I already have.