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http://www.adobe.com/devnet/logged_in/ehuang_tamarin.html
On November 7 at the Web 2.0 Conference in San Francisco, we announced that Adobe is contributing source code for the latest ActionScript Virtual Machine (AVM2) to the Mozilla Foundation. AVM2, the new scripting language engine for ActionScript 3.0 introduced with Flash Player 9, was designed to deliver the performance and features to support the needs of rich Internet application developers. The new open source project, known as Tamarin, will be hosted at mozilla.org and contributions will be managed by a governing body of developers from Adobe and Mozilla.
By partnering on the Tamarin open source project, Adobe and Mozilla hope to accelerate the adoption of a standard language for creating rich and engaging web applications. The Tamarin virtual machine will be implementing the final version of the ECMAScript Edition 4 (ES4) language specification. ECMAScript is a standards-based programming language widely used on the web—although you are more likely to be familiar with references to Adobe ActionScript, JavaScript, and Microsoft JScript than the name of the foundational standard these languages are based on. Adobe and Mozilla have been working together alongside other companies—such as Yahoo!, Apple, Microsoft, and Opera—on developing the ES4 language proposal as part of the Ecma International Programming Language technical committee (TC39-TG1).
"There is nothing better for a standard than to have it implemented in multiple products," said Secretary General Jan