Disneyland Crowd Prediction graph. I have used this graph for over 13 years or so before planning my Disneyland trips. I swear by it. They even factor in some random days not just months estimates. I also send it to famlies and friends I know who are planning their own trip.
If you are going to both parks, the best order to get your Fastpasses is like this: Radiator Springs Racers. (This ride is not connected to the other rides, so you can still get Fastpasses.) World of Color (This one's not connected either.) Space Mountain Indiana Jones Big Thunder Splash Mountain Star Tours Soarin' Tower of Terror California Screamin'