SensorPress brings simple uptime monitoring to the admin dashboard. Simple install the plugin add a few settings and your site will be checked every 15 minutes for FREE :).
SensorPress is a complete uptime monitoring solution for any WordPress site all in a simple and easy to use plugin. Rather then attempting to provide every feature under the sun, SensorPress makes monitoring simple and complete by providing just the features you need.
Some Features:
Find out more at SensorPress.com.