Now this is one very useful feature from Gmail, at last you can view multiple panels in one window. You can enable it in the through the Labs tabs, and these tabs can be configured to show different emails such as those unread, from a certain person, starred, with attachments, and a maximum of five different panels. The setup does look nice, but there is still room to clean up the look. Then there are a lot of other options to play around with in the Gmail Labs.

Panels by searches:

• is:starred
• is:unread
• has:attachment

Link: Lifehacker