This site is designed to take advantage of CSS. If you are seeing this, CSS must not be available or enabled in your browser. Everything should still work, but won't be as pretty. :)
The feature I really need - unless I'm just missing it? - is a way to model dependencies. The biggest case is that I don't want to get alerts for web sites I monitor when my home internet connection has a problem. In nagios I make external services dependent on my router ping, dns server ping, and google.com check and I'd like to be able to do the same thing in Simon.
Re: Dependencies
Simon handles local internet outages automatically. Before each check, it checks that it can access one of two popular domains (apple.com and google.com, if I recall correctly), and if not, goes into an offline mode until the connection is restored.
You can disable this feature on a per-test basis via the checkbox to allow checking when offline (e.g. for local-only tests, or if you want to be alerted when your local internet is down).