Mostly hits on there, but the likes of I Am Number 4, Source Code and Sucker Punch were definitely hurt at the box-office by the illegal downloads. With the exception of a couple of them, most of the titles on this list are aimed at young men - a demo that has cost Hollywood dearly at the box-office this year.
Fast Five - 9.26 million
The Hangover Part II - 8.84 million
Thor - 8.33 million
Source Code - 7.91 million
I am Number Four - 7.67 million
Sucker Punch - 7.2 million
127 Hours - 6.91 million
Rango - 6.48 million
The King's Speech - 6.25 million
Harry Potter and the Deathly Hallows Part 2 - 6.03 million
List comes via Torrent Freak.