To found out what my film of 2009 was I went though all the films I had given a 5/5 rating to over the last year on LoveFilm (the UK Netflix) and then had a look at what films that where actually released this year. Of those only one films matched and that means my film of 2009 was 500 Days Of Summer!
If I was include all films that I had seen this year, I would say my films of the year was The Final Cut, but I don't think as many people would agree with me on that one.