This article is from the rec.arts.movies.current-films FAQ, by Evelyn C. Leeper email@example.com with numerous contributions by others.
This data can be found at:
http://us.imdb.com/Charts/usatopmovies (for USA box office),
http://us.imdb.com/Charts/intltopmovies (for non-USA box office), and
http://us.imdb.com/Charts/worldtopmovies (for world-wide box-office).
a constantly updated list that is adjusted for inflation.