http://blog.sixsigns.com/2008/10/04/razuna-112-meets-gears/
Gears is a browser extension that allows you to create local version of files used on webpages. Developed by Google, it was originally created to allow for some of Google online applications, such as Google Reader, to work when users are not connected to the Internet.
Within Razuna however we are using it to store highly used files to speed up its online experience. The idea is that you don’t have to reach out across the Internet each time to pull some css, javascript, graphics and other static files, it will be a much faster experience. Future versions will store user content and will support the administration section as well. This works on all platforms and for all browsers.
Continues @ six signs blog