Well Avengers just reached #3 on both the Domestic and Worldwide charts for all-time ticket sales.
It's at just under $553 million on the domestic charts, pushing it about $20 million past The Dark Knight ($533 million). The only two movies above Avengers are Avatar ($760.5 million) and Titanic ($658.6 million).
For worldwide ticket sales, Avengers is just under $1.36 billion, which puts it ahead of Harry Potter and the Deathly Hallows Part 2 by over $20 million. Again, the only two movies that are above Avengers on the worldwide charts are Avatar ($2.78 billion) and Titanic ($2.18 billion).
I know it's highly unlikely, but how cool would it be for any movie to finally break James Cameron's 15 year deadlock on the #1 highest grossing film of all time?
Considering that Avengers was only released in the US one month ago today, I think it's safe to say that it's crossed over from blockbuster movie into worldwide phenomenon at this point.