Mania: There really aren’t any good corporations in the movies. They all seem to be flawed in some way, bent on making a boatload of cash, and willing to step on anyone that gets in their way. These evil conglomerates make for great story lines and have created a slew of villains throughout movie history.
This is a really good list, though I must say I'm a little saddened that Cocteau Industries from 'Demolition Man' didn't make the list.