Sustang

www.blackmask.com
etext.lib.virginia.edu
www.ebookjungle.com
www.fictionwise.com
www.e-book.com.au
www.web-books.com
www.free-ebooks.net
www.mslit.com/default.asp?mjr=FREE
http://www.microsoft.com/reader/prom.../free_shop.asp
www.gutenberg.net
www.ereads.com
www.pocketrocketfx.com/html/ebooks_a2m.htm

As well as your local public library and university library.
I was really suprised what I found when I accessed local library's online services !!!!