Hi Mollock!
Yeh i use 'hosttracker notifier' for my domain, and companies domain. Its a good service, but it is designed for direct administrators (those who have access to the physical 'box') as it will continue to prompt you until the site is restored. I use my gmail account for this, as i have them stacked in groups of 60 to prevent mass flooding. You receive a monthly report on total uptime, which is where those stats are from.
Hope this helps!
Gillam