Ebert's List of 312 Great Movies

With links to his reviews (via Newmark's Door). 

I have only seen 31 of these films all the way through that I can be sure of, though I may have seen others and simply don’t remember them.  For what it’s worth, I maintain Kieslowski’s Three Colors should count as three not one, and I should get partial credit for seeing several of Apted’s Up films, though I’m still working my way through them.  (I wonder if there will be a 56 Up in 2012?)