Even if Lynch suddenly published a solution to Mulholland Dr., and claimed that is what was intended, what it meant, I'd be reluctant to read it. There is no concrete meaning in any film, even the most lucid ones. On my second viewing of Mulholland Dr., as far as narrative goes, I was none the wiser as to what it meant, but I understood it far more; that is, my connection was far deeper, my appreciation more profound, than the first viewing. And I can't wait to see it again.

For now, this is my brief résumé of the film, if it helps:
It is best to approach this film as an unfathomable nightmare, and let it unfold itself; for, in true Lynch style, the meaning here is not an obvious one, presented as a character-switching Chinese-box-like succession of dark and disturbing fantasies. It registers on the unconscious and lingers on the mind like the most haunting of dreams.