http://jmjeong.com/index.php?display=Emacs/OrgMode
http://orgmode.org/worg/org-tutorials/orgtutorial_dto.html
C-c C-t for org-todo
M-S Ret for org-insert-todo-heading
[[link][description]]
C-c C-o for org-open-at-point
C-c C-l for org-insert-link
C-c a for org-agenda
C-c C-s for org-schedule