Is there a service that can monitor my web server and annoy me with phone calls (and or email) when it detects that its unresponsive to HTTP requests?
Pingdom has been working pretty well for me for a month. I only have a few sites in it, but it's noticed every time I've restarted the apache server :)
I have been using ServerGuard24 for > 3 years and am very happy. They send emails and sms and are quite cheap.
There's a blue zillion of them. Here's another one:
You can also use http://100pulse.com to monitor your website. They send email, sms, rss feed alert, gadget, twitter direct message alerts and more features