X-link to the DRM-free thread for a new Humble Bundle:
Humble Book Bundle Stranger Creatures supporting The Jane Goodall Institute presented by Brick Tower Press contains a mix of speculative fiction titles about imaginary creatures, and non-fiction books about real wildlife. The sfnal offerings include backlist from Esther Friesner, Tanith Lee, Bruce Coville, Alfred Bester, Philip Jose Farmer, Robert Silverberg, and more, and the lot can be gotten at the $15 upper-middle tier. There's a few repeats from previous Brick Tower/ibooks bundles, but plenty of new stuff.
For $20, you also get the non-sfnal wildlife books, and for $25, you can sponsor a chimpanzee and get a plushie (shipping & handling not included), with all proceeds from the higher pledge level going straight to the charity.