nagios check_crash || how to detect when a server has crashed and rebooted?

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http://serverfault.com – Thanks to the Intel TCO watchdog some servers i manage now reboot on a kernel or hardware crash and init scripts are now even 'rebootsafe'. Sadly this means that i no longer get a notification from nagios when a machine has crashed because the service is simply back up before the checks fire for enough times to send a notification. Is there a reliable script or nagios check out there that will let me get notified if say the machine has crashed say 3 times during the last 48 hour period? (HowTos)