This is now the 7th film to reach the mark, and more impressively the Pirates saga is the first film series to have 2 entries, although a uniqueness that will most likely only least a 12 month, The Dark Knight Rises, out next July, may join The Dark Knight, then, if you count the new Hobbit movies as part of The Lord of the Rings Saga, another Rings movie may join Return of the King.
Currently only one director has 2 film up there, and they happen to be in the top 2 slots, James Cameron's Avatar at the top and Titanic in the runner up spot, but again he could be joined next year by Chris Nolan and Peter Jackson, infact Jackson could be the first director to manage 3 film in the club then the second Hobbit film is released in 2013, only time will tell.
Giving an unfair advantage to this is the 3D tax being paid for these movies, of the 8 billion dollar films 4 were 3D so ticket prices had an unfair advantage, and despite the public decline in 3D it's still enough to give them a boost.
All these billion dollar movies still fall well short of Avatar which not only managed to get over 2 billion dollars but came close to the 3 billion dollar mark.
