New in Gmail Labs: Smart Labels

Google is launching a new feature in Gmail Labs called "Smart Labels," which helps users classify and organize their email. Once it is turned on from the "Labs" tab in "Settings," Smart Labels automatically categorizes incoming "Bulk," "Notification" and "Forum" messages, and labels them as such.

“Bulk” mail includes any kind of mass mailing (such as newsletters and promotional email) and gets filtered out of your inbox by default (where you can easily read it later), “Notifications” are messages sent to you directly (like account statements and receipts), and email from group mailing lists gets labeled as “Forums.”"

New in Gmail Labs: Smart Labels - Official Gmail Blog