For a few weeks now we've been supporting the new programming interface for Amazon's Simple Queue Service. The new interface comes with better pricing, especially for high-volume users that enqueue thousands of messages. See Amazon's site for details on SQS. The Dashboard now shows queues created with the old interface as well as queues created with the new one and there's a handy "migrate" button that converts an old-style queue to a new one:
We've also recently released version 1.7 of the Ruby RightAws gem with support for the two SQS interfaces. Please see the usual RubyForge location for details.