x: Mark the current task as done. Same as typing t x, but somehow it feels like it has more oomph as a single-character shortcut.

X: Mark the current task as done and create a new task at the same level, taking advantage of the task template I’d previously created in org-capture-templates.

N: Create a new note or task at the current position.

Make it easy to mark a task as done

(defun sacha/org-agenda-done (&optional arg)
  "Mark current TODO as done.
This changes the line at point, all other lines in the agenda referring to
the same tree node, and the headline of the tree node in the Org-mode file."
  (interactive "P")
  (org-agenda-todo "DONE"))
;; Override the key definition for org-exit
(define-key org-agenda-mode-map "x" 'sacha/org-agenda-done)

Make it easy to mark a task as done and create a follow-up task

  (defun sacha/org-agenda-mark-done-and-add-followup ()
    "Mark the current TODO as done and add another task after it.
Creates it at the same level as the previous task, so it's better to use
this with to-do items than with projects or headings."
    (interactive)
    (org-agenda-todo "DONE")
    (org-agenda-switch-to)
    (org-capture 0 "t"))
;; Override the key definition
(define-key org-agenda-mode-map "X" 'sacha/org-agenda-mark-done-and-add-followup)

Capture something based on the agenda position

(defun sacha/org-agenda-new ()
  "Create a new note or task at the current agenda item.
Creates it at the same level as the previous task, so it's better to use
this with to-do items than with projects or headings."
  (interactive)
  (org-agenda-switch-to)
  (org-capture 0))
;; New key assignment
(define-key org-agenda-mode-map "N" 'sacha/org-agenda-new)

Check out my Emacs configuration for other ideas.

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