to add the Most Popular pod back into the contnet management, run the following query:
INSERT INTO `ps4_contents` (`ContentID`,`ContentGroup`,`ContentRefID`,`ContentValue`,`ContentDate`,`ContentUserID`,`ContentPageName`,`ContentPageSetParentID`,`ContentPageSetOrder`,`ContentType`,`ContentParentGroup`)
VALUES
(15, 'Popular Pod', 'Header', 'Most Popular', '2010-01-14 13:44:04', 0, NULL, NULL, NULL, 'TXT', 'Home Page');
that test product will be replaced by an actual product when an order has been placed, you can put your store into test mode to place the order without going through the database and purchase the item you want to be the most popular.