"You may have noticed Google's experimental views for search results introduced the ability to view web pages on a map. We've been having fun enabling this feature for Google Maps."

http://google-latlong.blogspot.com/2008/05/mapped-web-pages-in-google-maps.html

I noticed this 12 days ago:
http://googlesystem.blogspot.com/2008/04/search-for-mapped-web-pages-in-google.html