The folks over at Google understand what a pain email can be. Especially those that get about a hundred emails a day. Most of those hundred emails may not even be important. Therefore, they've created a 'Priority Inbox' which allows you to separate your emails into, “Important and Unread”, “Starred” and “everything else”. The spam settings will still continue as normal.
After a while Google will start to predict which messages are important. There will also be plus and minus buttons for you to click whether the mail is important or not.
SOURCE: Google blog