> I hope it's a big market. It is. There are a lot of these kind of sites out there, with the (probable) leader being pingdom. Writing something basic is pre

> I hope it's a big market. It is. There are a lot of these kind of sites out there, with the (probable) leader being pingdom. Writing something basic is pretty easy for this, with a decent work-queue and a few worker nodes around the world checking from multiple locations. The hard part is the notifications via SMS, billing, and dealing with failures that are en route from your testing-agent to the real site. (i.e. False positives where you think things are down when actually they're not.)