I’ve now written several Nagios plugins and submitted them all to MonitoringExchange.
Here’s a quick summary:
- check_temper for monitoring the temperature with a TEMPer USB thermometer
- check_kernel for checking that the currently running kernel on an RPM-based system is the most recent installed kernel (not necessarily the latest available kernel in the repository)
- check_aql_balance for monitoring the number of SMS text message credits on your AQL account
- check_k8temp for monitoring the temperature of an AMD K8 (e.g. Athlon or Sempron) CPU
 See my blog post if you are interested in setting up SMS alerts with Nagios