There are other sites that provide access to free and for-sale e-books. Visit the site and limit your search to free.
Girlebooks - Books for girls - wonderful browsing, user reviews. Variety of formats to download, including standard EPUB. Free and not free e-books.
Archive.org - everything here is free, but not everything is an ebook. Limit your search to text. Here's where you'll find many obscure and ancient items. Check out their free video, too.
Diesel - free and publisher promotions. Registration required -- download in epub format.
Kobo - free registration required. Free e-books section, and every search can be limited to free. Lots of freebies and publisher promotions.
Download in Adobe DRM epub format, which requires Adobe Digital Editions (see FAQ).
W H Smith Bookstore - Excellent category pages for free e-books, including both public domain classics and publisher freebies. Some titles not available in the U.S; some titles seem to require a KOBO account.
InkMesh - Search for free and not-free e-books; many promotional items.