I haven't seen Black Swan. I saw the previews, and they didn't appeal to me, so I won't be seeing it. (My teenage daughter really liked it, though.)
I read Cuckoo's Nest and saw the movie decades ago and remember liking them both. Don't know what I would think today.
I really liked Good Will Hunting! I liked watching how the Robin Williams therapist character forged a relationship with Matt Damon. I also enjoyed the doofus therapists Matt Damon saw before finding Robin Williams, and how he handled them.
I also really liked A Beautiful Mind with Russell Crowe.
I have seen Girl, Interrupted but not read the book. My daughter and I were both puzzled because the Winona Ryder character seemed pretty "normal" to us and we didn't understand why she was institutionalized. I think we missed something in the editing... Maybe it was clearer in the book (or maybe we are just kind of slow!).