This page shows you the list charts. By default, the movies are ordered by how many times they have been marked as a favorite. However, you can also sort by other information, such as the total number of times it has been marked as a dislike.
I went through http://www.icheckmovies.com/movies/?sort=officialtoplists and found what movies were on USA Netflix Instant between August 4, 2013 and August 19, 2013.
218 films on 4 or more official top lists. 218/1830=11.9%
Expiring soon: Scarface (1932)
Supposedly coming soon to Instant: Memento, Donnie Darko, Downfall, Saturday Night Fever, Men in Black, 28 Up, The Purple Rose of Cairo
Note: Oldboy is on Netflix but it is a dubbed version, which many find disappointing. EDIT: FIXED!
All 5 films in the Fantomas series (dir. Louis Feuillade) are on Instant.
I plan to make a new version in a few months, but will not update this at all because I want to compare it with the later version.
Recommended sites for Netflix users: GoWatchIt.com or CanIStream.it (both let you search Netflix and many other sites to see where a movie is streaming), reddit.com/r/netflixbestof and InstantWatcher.com (see what is new to Netflix and what people are adding to their queue).
NEW LIST (made by Crisco B.): https://www.icheckmovies.com/lists/netflix+instant+movies+1plus+icm+official/crisco+b/