Mulholland Dr. is David Lynch's seventh full length feature. It was my introduction to the Lynchian underworld. After viewing several more Lynch films since, it still stands as my favorite.
Significantly darker than Blue Velvet, Mulholland Dr. is about the seedy underbelly of Hollywood. Without giving too much away, the plot is not as it seems at first. It is a fascinating portrayal of one woman's descent into depression. Like many Lynch movies, there is more than one interpretation of its events, each equally valid and equally enlightening.
What's so wonderfully entertaining about this movie is how many ways there are to enjoy the movie. Some might like the challenge of "solving" the movie (and there are numerous websites made to that end). Some might use it as a springboard to ponder the illusory nature of our perceptions. Some might simply enjoy the mysterious, dream-like atmosphere of the film. Viewing this film is an intensely personal experience, and everyone is bound to enjoy it in his or her unique way.