Flickchart is really much more fun than it ought to be. The idea is that Flickchart shows you two films and you choose which you prefer. On the basis of your selections Flickchart then starts building a list of your favourite films. The more selections you make, the more accurate your list becomes, in my experience anyway.
There are a lot of films missing at the moment as the site is still pretty new. In particular non US films are currently under represented (which explains why Hell Drivers in uncharacteristically absent from my favourites).
You're also able to look at charts reflecting the choices of all flickchart users. You can view the best films of all time, or even select genre's, directors, decades etc.
I recommend you check it out, better clear an hour or so though as it's fiendishly addictive! More than the charts, or the rankings, I just love being presented with films that I'd forgotten existed (for example Megaforce or Sssssss).