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Along with familiar features like group creation and search, Google Groups has a new look and exciting new features.

The Google Gadgets API is a simple way to create little applications that run on multiple sites, including iGoogle, Google Desktop, Google Page Creator, and thousands of sites all over the web that use Google Gadgets for Your Webpage. Google Gadgets reach tens of millions of users every week; even better, Google provides free hosting, free bandwidth and an easy way to submit your gadgets to the official directory, where users from all around the world come to find them.

Google Co-op is a platform that enables you to customize the web search experience for users of both Google and your own website.

The web is better when it's social The web is more interesting when you can build apps that easily interact with your friends and colleagues. But with the trend towards more social applications also comes a growing list of site-specific APIs that developers must learn. OpenSocial provides a common set of APIs for social applications across multiple websites. With standard JavaScript and HTML, developers can create apps that access a social network's friends and update feeds.

Flash file that explains how google works to some degree