Jumpple for WordPress by Jumpple.com is a plugin will notify you if something is wrong with your site.
With a click of a button your website, blog or online store are instantly monitored. Receive real time notifications if something is wrong with your website. It’s a free and easy way to protect your online presence.
How it works in 3 easy steps:
Register with your website and email.
Check your email for your account details.
Go to Jumpple.com and choose your notification types.
Plugin homepage: www.jumpple.com
Download and info: http://wordpress.org/extend/plugins/jumpple/