I'm working on ways to test my web site internally, and alert if something has gone wrong (query results in page not loading or bad results) but if my server is actually DOWN (power's out, ISP failure, etc.) I don't have any external way to test, until someone calls and says "hey, I can't access the website". What services are out there that will regularly ping your webserver and report via phone (SMS preferrred, but voice message acceptable)? Anyone using anything like this for their own web server? Internally, we're covered pretty good, but if there's a power outage, and the web server is physically DOWN, I don't have a way to know that immediately, 24/7 Thanks.