Some rather good sites for book lovers to be familiar with:
Project Gutenberg, an online library of over 40,000 public domain ebooks.
Distributed Proofreaders. For those of you with way too much time in your day, you can drop in and proofread a few pages of a book that will eventually end up in a Project Gutenberg ebook.
The Baen Publisher's free ebook collection. These books cycle occasionally, but all are free to download and keep (just watch out for missing out on part of a series).
Manybooks.net 29,000 titles, for the best price: free!
Munseys.com Over 30,000 hard to find titles in multiple formats, and all for free.
Inkmesh.com A search engine to find free ebooks, and to compare pricing for multiple platforms on other ebooks.
Books Should Be Free! Don't you agree? More free ebooks and audiobooks to download.