You can now filter movies by whether you've seen them or not. This is nothing new, since IMDB can already do it, but that's exactly why I felt the need to add the feature.
Check out the best movies you've never seen with this link (which will only work if you're logged in, obviously):
And this is all based on user ratings, so you gotta rate shit if you want it to be accurate!
Me personally... I haven't seen 331 movies on this site. I need to get crackin'!