Since our posting of April 6 here Jim Hamm has found another site, offering free e-books. He tells us, "If you enjoy reading e-books, here is an article describing various methods of getting free e-books. Also, the Calibre program discussed in the article is useful in converting a document into a format your device can use."
This just in: the last of April Amazon released a program for Mac, "Send to Kindle for Mac" that allows users to easily send personal documents and DR-free ebooks to Kindle ereaders and apps and the Kindle cloud archive from Mac computers. See more here.