Though I find it not really usable as my ebook reader you might want to checkout
Ouiivo Reader for iPad. Though buggy and unstable it has some interesting features in the user interface.
What makes the app un-usable in my opinion is that you don't flip "pages", you scroll (up) thru the entire chapter. Sadly, tapping right and left taps takes you to next chapter or section, not to next page.
Too bad as I found this app to be quite innovative, especially the reading "process" view.
As I say.. it's worth a look just to check out the "different" interface. Lot's of color and font options and some new concepts.
Note: To exit a book and return to bookshelf press the bottom right tab (when viewing book) and then press the "x" at the top right. IT IS NOT EASILY FOUND as to how to exit a book!
UPDATE: To exit book and get back to bookshelf tap the bottom right tab and then the "x" in the top right corner. Getting back to the bookshelf or "main" screen is NOT intuitive and it is NOT readily apparent as to exit a book.
I'm hoping the developer will add page turning and get this thing stable as they seem to have some great ideas.
NOTES:
- making wider margins will get the text off the "user options" tab.
- I still can't figure what the left bottom tab/button does.
- I could find no way to exit the instructions app.. . had to delete the app and redownload.