Gmail - Priority Inbox (Beta)
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Priority Inbox can help save you time if you’re overwhelmed with the amount of email you get. It attempts to automatically identify your important incoming messages and separates them out from everything else. Gmail uses a variety of signals to prioritize your incoming messages, including who you’ve emailed and chatted with most and which keywords appear frequently in the messages you opened recently.
When you click the Priority Inbox navigation link on the left-hand side of your mail, you’ll see messages grouped in three sections: Important and unread, Starred, and Everything else.
If Priority Inbox mistakes an email as important or doesn’t flag one that’s important to you, you can teach it to make better selections. Just select the message in question, and click the “mark as important” or “mark as not important” button; they’re the buttons with plus and minus icons just to the left of the Move to and Labels drop-down menus. 
When you mark a message as not important, it will move out of the Important section. Over time Priority Inbox will learn what’s important to you and incorporate the feedback you give via these buttons.
Note: Priority Inbox is not fully available in Gmail on a mobile device.
Limited support is currently available if you access:
- Gmail (gmail.com) in the web browser on Android or Apple devices
Learn more
- Gmail using in the built-in email program (IMAP or Google Sync) on most devices
View messages under the 'Important' label.
- The 'Gmail' app on Android devices, app version 2.3.2 or later
Learn more
Support for Priority Inbox is otherwise not available on mobile devices at this time.
updated 04/26/2011
http://mail.google.com/support/bin/answer.py?hl=en&answer=186531http://gmail.com/priorityinboxhttp://mail.google.com/support/bin/topic.py?topic=29809
