I find it useful to keep track of which tasks I've started. Adding the following line to the start of my Org file adds STARTED to my to-do status keywords.
#+SEQ_TODO: TODO(t) STARTED(s) WAITING(w) | DONE(d)
Here's some code to make it easier to clock in and out of tasks:
(defun sacha/org-clock-in-if-starting () "Clock in when the task is marked STARTED." (when (and (string= state "STARTED") (not (string= last-state state))) (org-clock-in))) (add-hook 'org-after-todo-state-change-hook 'sacha/org-clock-in-if-starting) (defadvice org-clock-in (after sacha activate) "Set this task's status to 'STARTED'." (org-todo "STARTED"))
Random Emacs symbol: isearch-update-ring - Function: Add STRING to the beginning of the search ring.