From the social search update: Google is also showing if a result is a subscription in Google Reader,

http://www.websonic.nl/nieuws/wp-content/uploads/2011/03/google_reader_subs.jpg

not new.

http://www.lostintechnology.com/wp-content/uploads/2009/10/googlesocialsearch2.png

via http://www.lostintechnology.com/how-to/what-is-google-social-search

Ha thnx!