I wrote up how I created a webinject test to be used with Nagios to check the Drupal Status Report for a component that is "Out of date". 

Ref: http://www.techadre.com/?q=content/checking-drupal-status-nagios-and-webinject

NOTE: I am working on moving all the "technical" content from this site (aka my personal page) to the Technology Cadre community site.