Check out @Yahoo! Sports Contributor NetworkAbout a month ago, the Baltimore Ravens capped off a great postseason by beating the San Francisco 49ers in Super Bowl XLVII, the team's second NFL title.The previous two seasons, the Green Bay Packers (2010) and New York Giants (2011) defeated the Pittsburgh Steelers and New England Patriots, respectively, to win their fourth Super Bowl titles.Looks like a case of the same old teams winning the same old championships.Truth be told that even in this age of parity -- and we're keeping this discussion to the Super Bowl era --of the 32 current franchises in the National Football League, only slightly more than half (18) have won at least one Super Bowl.That means there's still 14 clubs that haven't prevailed in the big game to date...http://sports.yahoo.com/news/next-14-nfl-franchises-still-haven-t-won-155500296--nfl.html