In org-mode you can quickly toggle todo states when you define shortcuts. For instance, my init.el contains the following TODO keywords:
(setq org-todo-keywords
'((sequence "TODO(t)" "NEXT(n)" "IN-PROGRESS(p)" "WAITING(w)"
"|" "DEFERED(f)" "DONE(d)" "CANCELLED(c@)")))
This allows me to tap e.g. C-t n on a heading to change its status to NEXT or C-t c to set it's status to CANCELLED and enter a reason. For more info, see Fast access to TODO states in the org-mode manual.
By default these pop-up in the other window, in my case this is often a document which I have open in a vertical split. I wanted these top pop-up at the bottom of the screen. By using the popwin package I was able to pull this off by adding the following lines to my config.
(require 'popwin)
(setq display-buffer-function 'popwin:display-buffer)
(add-to-list 'popwin:special-display-config '(" *Org todo*"))
(popwin-mode 1)
The trick was to set the display-buffer-function to use the popwin implementation.
Hopefully this saves someone a bit of time.