Places for getting free PDF books, chiefly works that have gone out of copyright. I started looking for these as I'd gotten my mom a Barnes & Noble "Nook". It's a nice gadget and we'll buy some contemporary works, but can afford to get free where possible.
- Planet PDF: http://www.planetpdf.com/free_pdf_ebooks.asp. This one seems to work.
- http://www.ebooknetworking.com/. Requires registration and "purchase" of free books, but also seems to work and includes some more recent works
- I'm working through this article, http://www.hongkiat.com/blog/20-best-websites-to-download-free-e-books-part-ii/; many of the links don't seem useful
Of course, there's a lot of technical works and studies in PDFs all over the net; I'm looking mostly for entertainment, not work.