anyone know of a site where you can read a book?
not really books, no but there are a lot of authors out there publishing short stories and stuff online... also, have you ever heard of fanfiction? Doesn't really fit your description of a book, but it would be something to read (www.fanfiction.net)
Project Gutenberg ( http://www.gutenberg.org/ ) has many public domain books, in various file formats.
Great site for books is scribd.com