Excerpt from an update on Gmail/Google+ integration; collateral damage companies in this instance will likely include Xobni (with its Smartr Inbox for Gmail) and Plaxo
Find information from the people you care about most
Looking for the info on an upcoming family holiday gathering but can't remember who sent it? If you've spent time building your Google+ circles, you can now quickly use them to filter your mail, saving yourself from having to sift through that pile of daily deal emails and newsletters. You can see messages from all of your circles at once or from each individual circle. And if you want, you can show circle names on emails in your inbox. Contacts can also be filtered by circles, making it easier to view your social connections.