'There is good and there is evil, and evil must be punished. Even in the face of Armageddon I shall not compromise in this'
Rorschach is a character from the wonderful graphic novel by Alan Moore (art by Dave Gibbons): Watchmen.
If you haven't read it, I cannot recommend it enough. I bought it a couple of years ago and I'm bloody glad I did.
A movie of this should be released in 2009. It's directed by '300' director Zack Synder and the trailer looks amazing: [link]
It probably won't make much sense unless you've read the Graphic novel, which again I say 'Go read it...Now!!!'