UptimeBar
A simple OSX menu bar app that notifies you
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Hunter's comment
UptimeBar connects to the UptimeRobot API to see how your websites are doing. This means you'll need an UptimeRobot account first.
UptimeRobot is trusted by over 500,000 users, meaning you can be sure we'll notify you as soon as something is wrong! You can sign up for an UptimeRobot account here.
A simple OSX menu bar app that notifies you if any of your websites are down. Never miss another minute of downtime
This is as cheap as a cup of coffee.
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Hunter: 
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