"Made-to-order” results with Google Site Search
Monday, May 3, 2010
With Google Site Search's new data rendering features, you can enable the return of search results in whatever format you’d like. You can control the size and position of images, personalize the attributes that are shown, insert lines of metadata into search results, and much more.

You can find more about the technical implementation details on the Google AJAX API blog, and can add Google Site Search to your website by visiting google.com/sitesearch.
Posted by David Gibson and Nicholas Weininger, Software Engineers