When it comes to building and hosting websites, you need to know they are not online. Every minute a client site is offline could mean lost sales, users going back to Google for the competitor or general frustration. To mitigate this, I use UptimeRobot.com to notify me when things start to go wrong. I like it so much, I built my own public facing status page which you can also download and host yourself (See below).
adam matthews
Music, Promotional and Live Event Photographer