I know 3 or 4 people who I don't particularly like who admit to downloading unpurchased movies on to their computers. Will Crime Stoppers give me money if I tell on them? Probably not, but if the movie studios were smart they would set up a hotline.
I don't quite get the moral logic behind people who download software, movies and music without paying for it. Stealing is stealing and it is wrong. If artists want to let you download their stuff free of charge, that is their prerogative. Otherwise, take out that credit card or do without.