One of the ebook readers that presents your ebook in the most book like form is Bookshelf. This software allows you to read text files as fancy designed books on your computer screen.
Bookshelf takes plain text (TXT) files and displays the contents as if they were printed in a book. You get two pages (or one if you wish) side by side with generous margins and a clean, uncluttered interface. You can click on the pages to turn them. It has a wide choice of page styles and convenient navigation system. Bookshelf easily allows you to come back to the read books and to open them in the place where you have stopped.
The War of the Worlds by H. G. Wells displayed in Bookshelf:
You can download Bookshelf for free. Version 2.72 is only 368KB. Version 4.11 adds some frills such as voice, but is ~900KB.
Other ebook readers include:
Microsoft Ebook Reader This program can't read txt and html files, and you can see only one page on the screen.
Adobe Ebook Reader This program can read html but can't read txt files. (File format: pdf, html, etd)
yBook Reader This ebook reader loads text files and web pages (including direct from an internet address), reformatting them into paperbacks for screen reading. Also includes a printout routine to generate booklets and hard copy for binding, plus a compiler to generate your own ebooks for distribution.