IMDb is already one of the most awesome movie apps on the market. With the world's largest and most popular catalog of who's-in-what and which-came-out-when, IMDb has single-handedly solved that whole "I recognize his face, but what was he in?" problem. Today, it's getting even better by adding support for the oft-forgotten IMDb message boards, providing recommendations based on your movie tastes and, perhaps best of all, Metacritic scores.
The Metacritic scores are perhaps the most exciting, as the site is one of the better opinion aggregators out there.