Amazon improves EC2 (by embracing failure)(Amazon改进EC2（处理故障）)

Amazon just announced two big improvements to EC2:

• Multiple Locations
  Amazon EC2 now provides the ability to place instances in multiple locations. Amazon EC2 locations are composed of regions and Availability Zones. Regions are geographically dispersed and will be in separate geographic areas or countries. Currently, Amazon EC2 exposes only a single region. Availability Zones are distinct locations that are engineered to be insulated from failures in other Availability Zones and provide inexpensive, low latency network connectivity to other Availability Zones in the same region. Regions consist of one or more Availability Zones. By launching instances in separate Availability Zones, you can protect your applications from failure of a single location.
  
  
• Elastic IP Addresses
  Elastic IP addresses are static IP addresses designed for dynamic cloud computing. An Elastic IP address is associated with your account not a particular instance, and you control that address until you choose to explicitly release it. Unlike traditional static IP addresses, however, Elastic IP addresses allow you to mask instance or Availability Zone failures by programmatically remapping your public IP addresses to any instance in your account. Rather than waiting on a data technician to reconfigure or replace your host, or waiting for DNS to propagate to all of your customers, Amazon EC2 enables you to engineer around problems with your instance or software by quickly remapping your Elastic IP address to a replacement instance.

Datacenters and geographic regions are Single Points of Failure (SPOF) too.  Failure Happens, and it's far better (and cheaper) to build services that are resilient to failure than to try to prevent them from happening.  This is a big step in the right direction.

Update: RightScale posted an excellent overview of how this works.