Below are a few links that will take you directly to the various submission pages. Just be aware that with some of them, if you later intend to charge for your book, you may not be able to remove the free versions from these sites. Some of them will simply link your book to your Smashwords page. Others, such as ManyBooks, will create their own versions.
http://www.getfreeebooks.com/?page_id=81
http://www.e-booksdirectory.com/submit.php
http://www.freebookspot.me/
http://manybooks.net/contact-authors.php
http://www.witguides.com/addlisting.asp?cat=47
http://online-novels.blogspot.com/20...-links_02.html