<< The people widget surfaces content from friends, family and colleagues that is already available to you but may be hard to find and makes it easier to connect with them.

Next to every email message you can now see contextual information about the people in that conversation including recent emails you received from them, relevant Buzz posts, shared documents and calendar events. You also have quick access to a variety of ways to communicate with individuals, start a group chat or schedule a meeting with groups of people. >>

http://3.bp.blogspot.com/-sAjaVGmzK4g/Td6EZ_6X9GI/AAAAAAAAAF8/n28Zq1VfPec/people_01_group.png

http://1.bp.blogspot.com/-amYD5T4qHsY/Td6EZmcm1sI/AAAAAAAAAF0/oPWcqOo5Czg/people_03_individual.png

http://gmailblog.blogspot.com/2011/05/introducing-people-widget.html

http://mail.google.com/support/bin/answer.py?answer=1251806