Enabling Offline Web Applications

Google Gears (BETA) is an open source browser extension that enables web applications to provide offline functionality using following JavaScript APIs:

Store and serve application resources locally

Store data locally in a fully-searchable relational database

Run asynchronous Javascript to improve application responsiveness

Developer site
Frequently asked questions
Developer Forum

• Firefox 1.5+ and Internet Explorer 6.0+
Google Gears (BETA) is available for Windows, Mac, and Linux