From Google Blog
Quote:
The personalized homepage was created to bring together the stuff that interests you from across the web. From an engineering perspective, this became an opportunity to create a framework for all types of content and information. Supporting RSS and Atom feeds was one step in that direction, and today we're excited to start supporting richer web apps as well.
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Here is more helpfull link
http://www.google.com/apis/homepage/
You can see the demo here
http://www.google.com/ig/directory