When I shut down my computer I want to show some pending tasks that I have to do before leaving the office...

I did a local application to manage those tasks, so basically I just want to run a command, and shut down after I kill the app executed.

I have already tried with these options:

* /etc/gdm/PostSession/Default --> this works only when I select LogOut option instead Shutdown.

* /etc/rc0.d/K01mycustomscript --> execute script after X is killed

* $HOME/.bash_logout --> This looks like does nothing.

* ./app-to-run && sudo shutdown -h now --> Don't like it for 2 reasons, prompts for sudo password, and can't use my laptop shutdown button.

I am using Ubuntu 10.04