Many users have noticed that their Facebook Fan page list has vanished from their INFO tab. The list of pages and groups is normally at the bottom of the INFO Tab for you to reference and share with your friends.
If your list has vanished, go to the Fan Page Browse section here http://www.facebook.com/pages/?browse then select MY PAGES. A list of the pages you are a fan of will display.
Facebook is aware of the problem, but currently has no date for a fix.
Hope this helps!