ash_borer: (also comes with a paid version) is my favourite movie info app. Has ratings from IMDB, Flixster, Rotten Tomatoes, and Metacritic. The layout is great, you can create your own lists (to keep track of what you want to watch, for example).
THIS VERSION IS NOT SUPPORTED ANYMORE.
Download Movie Roll 3 for all new features, you can find it on the developer's page Movie Roll is a client and a guide for TheMovieDB.org and Trakt.tv. It's also collects and shows detailed information about movies, shows and actors from multiple sources.
No registration is required.
Most recent YouTube trailers from multiple channels.
Account features of TMDb and Trakt (watchlists, custom lists, comments, checkins, ratings etc.).
Information from Wikipedia, IMDb, Rotten Tomatoes, Metacritic, Flixster and other open sources in one app.
Suggestions and powerful search by genres, years, actors and studios. and.
Community for suggestions and beta testing: https://plus.google.com/u/1/communities/108497807849878900172
— Social highlights and images from Twitter and Tumblr.
— Search showtimes and local local theaters provided by Foursquare.
— Release alarm notifications for premieres, DVDs or custom dates.
— Homescreen widget.
— More options.
— No ads.