Another way to Access Public Domain Books
Nice clean interface. Titles can be read on the site in an easy to read html format or downloaded as a PDF for off-line browsing. They feature a "book of the day" as well. (The tag cloud does a search on the Amazon site for purchase.)
"The full text archive is a collection of free books that you can read online. You can now enjoy reading them free of charge and Full Text Archive is ever-expanding so please visit often."