The definitive source for most anything you might want to know about a movie information online is The Internet Movie Database (IMDb). If you go to the IBDb site on your iPhone, it will redirect you to their mobile site, which is more usable on the smaller screen. However, even better than that, is their free app.
For practically any movie ever in the theaters (and even some not in the theaters), the IMBb app has 1 to 10 star ratings, user reviews & critic reviews, trailers, photos, release dates, director, writers, cast & crew, plot summary, a full synopsis (if you don't mind spoilers), trivia, quotes, goofs (errors in the movie), etc. It even has a parents guide with seemingly the same content as Kid's in Mind.