One of the video podcasts I subscribe to occasionally do a game involving the website
Flickchart, where you basically rank the movies you've seen to create your own personal movie rankings according to your choices. I finally decided to join the site myself and am quickly finding myself addicted so I thought I would share the site here too.
Basically you are given two movies and options like if you haven't seen one, or both to replace them with new selections and then you choose which of the two you like more/think is better (however you make choices). Then over a period of time the top 20 bar fills up on the left side of the page and as you make more and more decisions you can use filters to focus your choices, either on the list have so far, or genres, by actor/date, etc.
You can see my top 20 so far after only about 100 random movies ranked. I'm sure a few of those will fall out over time after I do more and refine the list. Have fun! I know much of my spare time will be wasted here.