QUOTE(Crotchetymum @ May 21 2009, 09:30 AM)

Margaret Rutherford as Miss Marple.
Absolutely brilliant! I want to be Margaret Rutherford when I grow up/old, providing I can find a decent cloak-maker. Style icon

Rebecca I really enjoy. I'd read the book before I saw it, my husband didn't know the story at all, so he thought we were watching just a rather sweet romantic film until...well, you know (I won't spoil it for anyone who doesn't know!) It was just so funny to see him sit bolt upright and say 'did you know that was going to happen?' as his perception of the genre he was watching did an about-face.
Arsenic and Old Lace surely deserves a mention.
Not entirely b'n'w, but A Matter of Life and Death is a great one - probably as much for its use of b'n'w v. colour as part of the film.
To Kill a Mockingbird - interestingly I'd only ever seen it in b'n'w, but then when I saw it on DVD to buy it was a colour version. It wasn't a colourised version (you know, where they've painted the colour on later), it actually was filmed in colour but b'n'w copies were done too. I couldn't bring myself to watch it in colour though, it just wouldn't be right!
TCM and TCM2 can be good for old black and white films, though they do put more recent stuff on as well. It was TCM, I think, that introduced me to the Marx Brothers...