Blog Kindle (unofficial) has an article on Bookyards. I must admit I had never heard of them. They have about 17,000 free ebooks in Kindle PDF format, says the blog.
This free e-book library is mostly education oriented. So, a student, or a researcher, or just a curious erudite might find this resource a very useful one. If you were looking for an electronic version of C. Bresciani Turroni’s Economic Policy For The Thinking Man, or perhaps the Marquis de Nadaillac’s Manners And Monuments Of Prehistoric Peoples, or Charles Marquis Smith’s Electric and Magnetic Measurements (all of which are unavailable in Kindle edition on Amazon) – then Bookyards will become your favorite source for e-books.
The organization of the site is pretty easy to navigate; all the available e-books are a couple clicks away from downloading. Also, Bookyards displays the list of the most popular downloaded e-books on the front page. To my giggly astonishment, one of the most downloaded books is not Adventures of Huckleberry Finn or The Kama Sutra of Vatsyayana (kudos to Project Gutenberg’s Top 100), but it is Sharipov’s Classical Electrodynamics! See? What an extremely different contingent of e-book users frequents Bookyards.
What’s “Kindle PDF”? new DRM scheme?