I'm looking for a solution to monitor several hundred websites that we host, but want to monitor them from the outside. We have SAM, NPM,etc running internally which we do monitor sites, but am looking for something we can host outside of our network. Curious what others are doing. I know there are hundreds of those free/cheap monitor sites out there, but they are limited in number of monitors and alerts. Just looking for up/down type monitoring.
Have you checked out DNSStuff? I believe SW owns them as well.