Today when I logged into my Gmail account I found a new surprise. A new option of Circles was added. Though it was added a day before but I saw it today. With some goood features.
Firstly, if you have the person in your circle and you had a conversation with him or her it will show the Circle name in the subject with blue background.

On, the left side u will see a Circles option, like this-

As you click on the circles option it shows you a list of circles.

The conversation done with the Circler's will be shown.

Also when you select different circles it shows you the conversation done with the Circler's in a more filtered way.

Features:

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Keep Your Contact information updated.

If your contacts have a Google profile, their contact entry in Gmail will be updated with the profile information they’ve shared with you, including mobile - phone numbers, email addresses, etc. also if the user changes it you will be notified about the same.
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You can share Effortlessly without leaving your *gmail. *


You will be able to share images from gmail itself to Google Profile, without switching.
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You can see what your friends are saying.