One of my favourite sites on the web, and one of the most useful if you like movies, is IMDB (The Internet Movie Database), now you can get all the information that the IMDB website provides on your iPhone with the IMDB iPhone App.
The Internet Movie Database (IMDb) is the largest collection of movie, TV and celebrity information anywhere. We aim to list every detail about every movie and TV show ever made, including who was in it, who made it, the plot, user ratings, trailers, photos, reviews, and trivia.
The IMDB works pretty much the same way the website does, although it doesn’t support accounts as yet so you cant log in and rate movies, maybe this is something they could add in the future.
The IMDB iPhone App is available for free from iTunes.