Adobe AIR

Adobe ? AIR ? runtime allows developers to use proven web technologies to create rich web applications that run outside the browser on multiple operating systems. You'll always have your applications at your fingertips, making it easier and more convenient to use. After installing it, you still need to download the applications directly for the product, and only then will you have your web application fully available from the desktop.

Companies like eBay and AOL are using Adobe AIR to create exciting new applications that allow you to use their services on your desktop.