Every day and once on the weekends you should scan through stock charts and see what's going on with the market. And once a week or so you should scan the movie page (or website) and see what films are going to be playing next week. This is especially important if you live close to artsy types of theaters that show rare, foreign, and independent movies. Sometimes I forget to run this scan and I am sure I have missed some great movies for it. Because of this scan I have found such gems as Twilight Samurai, Los Olvidados, and Sideways.
Today I found Save the Green Planet! which looks pretty good.