Montastic Is Fantastic
Probably the worst title I’ve ever chosen for a post.
Regardless, I’ve been using Montastic for a month or so now, and it’s great. It’s a free website monitoring service that lets you know by email when it can’t reach one of your sites. It’s got a limit of 100 sites (I’ve got a ways to go before reaching that). I’ve only received one false positive since I’ve started using it.