Started   reading   "Programming  from  the  Ground  Up"[1]  (Jonathan
  Bartlett).   It's  a  free  (GNU  FDL)  book  about  x86  assembly  on
  GNU/Linux.  I'm familiar with the basics of assembly but there's still
  a lot to learn. :-)

  Also bookmarked the  "ASM  Community  Book"[2].  While  we're  at  it,
  here[3]  is  a  pretty good reference of Linux Syscalls, their numbers
  and what to put in the registers.

  I find this a  lot  more  interesting  than  books  on  more  abstract
  languages  such  as  Java,  Ruby,  Python  or  whatever.  In  the end,
  everything boils down to machine language instructions. Assembly is  a
  lot closer to what actually happens.

  ____________________

  1. http://download.savannah.gnu.org/releases-noredirect/pgubook/ProgrammingGroundUp-1-0-booksize.pdf

  3. http://www.asmcommunity.net/book

  3. http://syscalls.kernelgrok.com/