Edit Oct 2014:u00a0 http://booksee.org and http://bookzz.org seem to be the two working versions now. Edit July 2014:u00a0 Bookfi is gone, but http://bookzz.org seems to be the official clone now. Edit April 2014:u00a0 bookza is down, but /, another clone of bookOS/za is up now!u00a0 Also,u00a0 is another clone.u00a0 These just pop up!Edit January 2014:u00a0 http://bookza.org is a functional clone of bookos that's live today!Edit December 2013:u00a0 Unsurprisingly bookos seems down for good now.u00a0 At the moment, it seems http://en.bookos.org/ is unbeatable.u00a0 Direct downloads, amazing selection, no ads, etc...u00a0 prolly won't stay up for too long though.