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Simple Emacs mark completed function

I've been in the habit of keeping track of things in todo lists using Emacs's outline-mode. This works great to organize things but I needed a better way to mark completed items. I have the files in source control so I could delete them and still know of them using a diff with a previous version but this is clumsy. Otherwise, I could mark items with a date or a DONE but this gets ugly. instead I have this simple emacs function that takes the current line as moves it to the bottom of the file with the date prepended.

Simple.

(defun mark-completed ()
"Move the current line to the bottom of the file and prepend the date."
(interactive)
(save-excursion
(progn
(move-beginning-of-line nil)
(kill-line 1)
(end-of-buffer)
(if (not (eq 0 (current-column)))
(newline))
(insert-date)
(insert " - ")
(yank))))

See

http://www.beaconhill.com/blog/?p=48