Can I ping my EC2 instances from within Ylastic?
Ylastic provides a super simple way to ping your ec2 instances. On the instances page, select the instance of your choice and click the Check Ping times for Instance button. That's it. Ylastic will ping your instance from six different locations around the world and display the round trip times. You can also do this from an iPhone, Android or Blackberry6.
http://blog.ylastic.com/ping-ec2-instances-from-around-the-world