>Great minds think along same lines. ROFL/snicker :-) I am in the process of contemplating such an app now.
You don't need to build one. You can use Web Monitor or others for this.
http://www.west-wind.com/webmonitor.aspIt isn't free but certainly won't break your bank, and can do a lot more like check whether your server's still up and running and if not restart the Web services etc.
+++ Rick ---