This snippet helps me keep track of what I’m supposed to be doing.
I’ve bound it to F9 F9. Calling it with C-u brings me to the planner
page so that I can complete the current task or look at the context.
F9 F9 from that page will restore my window configuration.

(defvar sacha/window-register "w"
  "Register for jumping back and forth between planner and wherever I am.")
(defvar sacha/planner-current-task nil
  "Current task info.")
(defadvice planner-task-in-progress (after sacha activate)
  "Keep track of the task info."
  (setq sacha/planner-current-task (planner-current-task-info)))

(defun sacha/planner-what-am-i-doing (&optional prefix)
  "Make it easy to keep track of what I'm supposed to be working on.
If PREFIX is non-nil, jump to the current task, else display it
in a message. If called from the plan page, jump back to whatever
I was looking at."
  (interactive "P")
  (if planner-timeclock-current-task
      (if (string= (planner-task-page sacha/planner-current-task)
                   (planner-page-name))
          (jump-to-register sacha/window-register)
        (if (null prefix)
            (message planner-timeclock-current-task)
          (frame-configuration-to-register sacha/window-register)
          (planner-find-file (planner-task-page sacha/planner-current-task))
          (planner-find-task sacha/planner-current-task)))
    (if prefix
        (planner-goto-today)
      (message "No current task. HEY!"))))

../emacs/planner-config.el