Several of the greats (and many of the "pretty goods")) of pulp SciFi and Fantasy have books available in the public domain. A great place to get these in epub format is Feedbooks.com. Many authors have only a portion of their work in the public domain, like Philip K. Dick and Harry Harrison.

You can read epubs on a portable reading device or computer/laptop using freely available reader apps.

Edgar Rice Burroughs (Tarzan, John Carter)
http://www.feedbooks.com/author/23

Robert E. Howard (Conan, Solomon Kane)
http://www.feedbooks.com/author/245

E. E. "Doc" Smith (Lensmen, Skylark)
http://www.feedbooks.com/author/150

Philip K Dick
http://www.feedbooks.com/author/1023

Harry Harrison (Deathworld, Planet of The Damned)
http://www.feedbooks.com/author/219

Henry Beam Piper (Terro-Human Future History and "Paratime" )
http://www.feedbooks.com/author/114

Those are some great links, MT.  Thanks for posting them here.  I've not been to Feedbooks before.  It looks like a great resource and I like the PDF formatted books.

We've got a page of free ebooks in the resources section but I've not updated it in a long time.  All our links are to Project Gutenberg.  I'll have to put some thought into updateing that section with links to other sites like Feedbooks.

Anybody got any other sites they like for free ebooks?