The absolute best film/tv page of all time, the Internet Movie Database, IMDB. It has a massive archive of films and a huge user-following.
Ever wonder why a movie has a certain rating? Want to know if the movie is suitable for you or others? Kids-In-Mind is a site with in-depth break-downs of any violence, nudity, and profanity making sure that you get the exact low-down of any film's content.
My favorite-ever film reviews come from Ebert & Roeper & The Movies the Chicago film-reviewing duo that recently changed up the show after the death of Ebert's original and most famous partner, Gene Siskel.
Talking Pix, an up-and-coming British-based site with movie and book reviews worth checking out.
Facets Multimedia is the ultimate source for unknown, independant, and foreign films. A theater in Chicago, Facets is also a location to learn about and discover films, not just watch them.
The Criterion Collection, for any fan of high-quality DVD transfers and classic films, the Criterion Collections DVD series is definitely worth checking out.
Rotten Tomatoes, an interesting film site that rates movies as either fresh or rotten on "The Tomatometer." In other words, the sites takes professional reviews from papers, websites, and magazines across the country then averages whether or not the review was positive in order to deem the film good or bad.
MovieBud Forums, a great site for film-related forums, great for finding out questions about films from other movie buffs.