This is an app that pings your website once every hour. You will be notified by mail if your site is down. Maybe you could test it and drop me some criticism?
The first thought after seeing this app running is that the db calls are most expensive. I am working on moving most operations to cache and persist them to db storage once a while.
App was written using technologies: Java 1.6, Eclipse 3.6, AppEngine 1.7, Git, Bootstrap theme