Robert Scoble blogs about the clustered search results in Google.
But presently, the clustered search results and refine search option seem to be limited to places.
In fact it seems to be the Google version of a tourist guide!
For instance, when I search for "Taj", which can be Taj Mahal, or the Taj Group of Hotels, or the Taj brand of tea ( All of them are popular!) I don't get clustered results.
But when I search for Bangalore, I do get clustered results!
Jay, from Bangalore