Added to post on April 5:
To see the parents' guide for other movies, search the movie title at IMBD and scroll to additional details. The parents' guide is the third item listed, right after the movie rating.
I'm going to add more info -- here is the parental advisory for the movie Cars, one of our favorites. Because these parental notes are made by viewers and people registered at IMDB, all the info is contributed by various people. The quality of the information depends on the involvement of the community members. At this time, I see several details mentioned that I was unaware of. I have seen Cars dozens of times and had no idea that the word "hell" is said twice. (In fact, I would be interested to fact-check whether that is accurate or not.) Also at this time, I see that a scene that I feel is quite scary is not mentioned at all -- when Lightning is accidentally dropped out of Mack's trailer onto the highway and he is in a perilous situation as cars dart around him to avoid an accident, he is nearly run over by three semi trucks, and he is panicked and lost at night in an unfamiliar place. (In our first views of this movie, I would always fast forward through this scene.) I don't think the review mentions the taunting / teasing of Mack by a gang of four "bad attitude" cars either. Now that I think of it, the review does not mention Chick Hicks' role as a somewhat "bad guy" or any of the things Chick's character or his pit crew does that are somewhat mean, like teasing or bumping during races.
I'm going to have to join the IMDB community to help out with the Cars review! I encourage parents who value this to also work as a community to present the facts about movies to each other so we can all be informed about which movies our families choose to watch together.
Do you know of other helpful parental guide resources?