Ok, so I've got appt working with org, along with Gnome popups with
zenity to alert me of events.

I wanted to aggregate the advice I'd received into one place, which
could be posted later to wiki or worg, etc.

I would welcome feedback, as I'm currently vetting this
configuration. I'll post any updates if I find a problem.

Thanks.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; For org appointment reminders

;; Get appointments for today
(defun my-org-agenda-to-appt ()
  (interactive)
  (setq appt-time-msg-list nil)
  (let ((org-deadline-warning-days 0))    ;; will be automatic in org 5.23
        (org-agenda-to-appt)))

;; Run once, activate and schedule refresh
(my-org-agenda-to-appt)
(appt-activate t)
(run-at-time "24:01" nil 'my-org-agenda-to-appt)

; 5 minute warnings
(setq appt-message-warning-time '15)
(setq appt-display-interval '5)

; Update appt each time agenda opened.
(add-hook 'org-finalize-agenda-hook 'my-org-agenda-to-appt)

; Setup zenify, we tell appt to use window, and replace default function
(setq appt-display-format 'window)
(setq appt-disp-window-function (function my-appt-disp-window))

(defun my-appt-disp-window (min-to-app new-time msg)                      
  (save-window-excursion (shell-command (concat 
    "/usr/bin/zenity --info --title='Appointment' --text='" 
    msg
    "' &"
    ) nil nil)
))


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