Google Closure tools

Google announced the availability of Google Closure Tools, a set of JavaScript tools to help development of web applications. The set contains:

• Closure Compiler: a JavaScript optimizer
• Closure Library: a JavaScript library with reusable UI widgets and controls, utilities for the DOM, server communication, animation, data structures, unit testing, rich-text editing etc.
• Closure Templates: a client- and server-side templating system that helps you dynamically build reusable HTML and UI elements.