Zencoder has been affected by the Amazon EC2 outage today, and we've seen significant downtime. As you can imagine, we're taking this extremely seriously. Our hands are tied with respect to EC2 itself - we're at Amazon's mercy there - but we're actively working on getting something online so our customers can get back up and running. We're really sorry about the problems and will take steps to eliminate today's failure points in the future.
For updates, see http://status.zencoder.com.
We'll write up a postmortem when we can.