If you develop apps based on third-party APIs like Google, Facebook, Twitter, or Salesforce, sometimes it can be difficult to tell whether service outages are due to your app or due to a problem at the API. Sure, you could check downforeveryoneorjustme.com, but that can be time-confusing.
Now, Dutch website monitoring service WatchMouse has released API-status, which lets you know which of the most popular APIs are down at a glance. In addition to the current status window, it also offers a look at recent history with various graphs and a map showing localized outages.