The movie will peak out at $83 million domestic box office and will wind up being the 22nd highest grossing film of 2005.
Moreover, the DVD has been in the #1 spot on amazon for 12 of the last 15 days (it fell to #2 behind Kink Kong for about 3 days). I imagine it will be there for many more days to come!
Incidentally, it is a GREAT movie.
4 weeks at #1 on amazon.com's DVD sales chart and still going strong! Hurray for Brokeback!