This one is highly recommended:
yBook - ebook reading software to provide a 'paper book' experience on
the computer screen:
For a start, you get two pages side-by-side instead of just one page in
the middle of the screen. (Although I have just added a single-page mode
which should suit tablet PCs in portrait mode)
Next, the pages turn when you click them, just like a real book.
Finally, you can also select a textured background to make the pages
look like real paper.
yBook is FREE to download and use - why not give it a try?
Features:
- Runs on Windows 95/98/ME/NT/2K/XP and Linux (using Wine)
- Display your book on side-by-side or single pages.
- Resize the pages, adjust the margins, set text and paper colour.
- Loads TXT, HTML and compressed PDB or PRC text files
- Search for words or phrases
- Automatic bookmarks
- Text sizes from tiny to HUGE
- No zooming, panning or scrolling
- Direct download of all Gutenberg titles, with index.
- Internationalised menus - Spanish, German, etc
- Completely free to use: No registration, no adware, no spyware
http://www.spacejock.com/yBook.html