From mboxrd@z Thu Jan  1 00:00:00 1970
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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: Add font-lock pattern to all modes in Emacs 22.x
Date: Fri, 23 Feb 2007 12:31:03 -0500
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> (defun my-font-lock-mode-hook ()
>   (font-lock-add-keywords
>    nil
>    (list (cons (concat "^.*" (replace-regexp-in-string "[ \t]+$" ""
> comment-start)
>                        ".*?\\(TODO\\|todo\\|Todo\\|FIXME\\|fixme\\|
> Fixme\\)")
>                (list '(1 'my-todo-face t))))
>    'add-to-end))

Try:

(defun my-font-lock-mode-hook ()
  (font-lock-add-keywords
   nil
   '(("\\<\\(TODO\\|[tT]odo\\|FIXME\\|[fF]ixme\\)\\>"
      (1 (if (eq (get-text-property (point) 'face) 'font-lock-comment-face)
             'my-todo-face))))
   'append))

It will also work in multiline comments ;-)


        Stefan


PS: Guaranteed 100% pure untested code only, of course.