E-mail overload? Priority Inbox can help. This feature, currently in beta, separates the junk from the important stuff, and organizes it to help you focus on the messages that matter. The more you use Priority Inbox—by clicking the yellow (+) button to denote relevant e-mail and the white (-) button to mark it as "everything else"—the smarter the feature gets at recognizing which messages it thinks are important to you.
To activate Priority Inbox, go to your Mail settings. Look for the Priority Inbox link at the top and click it. Then under the Show Priority Inbox setting, select Show Priority Inbox. Save the changes. You can then go back into the Priority Inbox setting to customize it.