I love going here:
http://us.imdb.com/top_250_films to find out all the oldies that are highly rated and then download/rent the movies. I just never got into the pre-80's movies until recently. Just saw Citizen Kane this year.
It amazes me how they rate Shawshank Redemption as the #2 movie of all time. I really loved it, but c'mon - #2?