Over the weekend, Facebook seems to have quietly added a great new feature for Page Admins — now, in the settings of your Page (not your personal profile), you'll find a new item: "Onsite Notification."
Check the box and you'll get notifications on the Facebook site whenever anyone posts, likes, comments on, or sends your Page a message.
This is a great new feature — previously, Page Admins had to either log in manually as the Page or rely on emails to get these notifications. You can find it on your Page under Edit Page —> Update Info —> Your Settings.
One thing to note: If you get lots of likes and comments, you may quickly find yourself overwhelmed by notifications, so this is best for pages with a smaller fanbase.