For example, the top pane in my inbox contains only unread emails located in my inbox (as opposed to unread but archived emails); it is based on the search "is:unread in:inbox". Another pane displays emails in my inbox that I have labeled "todo" or have starred, not including the unread emails in the first pane ("in:inbox (label:tod
[image courtesy of the Official Gmail Blog]
Multiple Inboxes is a Lab feature and must be enabled before you can configure it. For more information, see the Gmail blog post New in Labs: Multiple Inboxes. The list of Gmail search operators can also be very helpful in setting up your inboxes.