As you all well know, Amazon Web Services had some serious problems last week. It all boiled down to a failure in Amazon's Elastic Block Storage system, where replication was broken, and the system attempted to do emergency replication of data, which exacerbated the problem. Basically: fail-over mode made it worse. The lesson is obvious: don't rely on one cloud alone. But rather than prattle on about this, I'll include some links to others who have chimed in on the affair with their sage advice and thoughts.