Here are some places to visit to find some content in ePub format for eBooks.
(These will work on most ereaders, including the iPad.)
epubBooks
epubBooks provides a selection of high quality, free ePub eBooks, for everyone to read and the collection is growing daily.
Google Books
To get started, just find any public domain book on Google Books and click on the Download button in the toolbar.
Feedbooks
On Feedbooks you'll discover thousands of public domain books and original books from new authors that you can read on any mobile device.
Snee
These were created from the free books available as part of Project Gutenberg. (In English and other languages)
epub2Go
This free web site allows you to convert a PDF to an EPUB file (for easier reading on an iTouch or iPad.)
