Who Watches the Watchmen?

Like any good systems administrator I have systems in place that monitor what is going on with my servers and network. To do that I am using OpsView Community Edition. However one thing that has always been an issue is how do you make sure your monitoring solution is up and running? I solved that today with uptimerobot.com. I simply signed up for an account and 3 minutes later I had everything set so that I got an email if my OpsView box did not respond to pings. Simple, easy and best of all free.