Amazon Polly has replaced the IVONA Speech Cloud Beta service.

Amazon Polly is a service that turns text into lifelike speech. With dozens of lifelike voices across a variety of languages, you can select the ideal voice and build speech-enabled applications that work in many different countries. It's easy to get started with Text-to-Speech — Generate up to 5 million characters per month for free during the first 12 months with the Amazon Polly Free Tier.