The trailer and poster for Kenneth Lonergan's Margaret have gone online.  The long-awaited and long-delayed follow-up to Lonergan's You Can Count on Me, Margaret centers on a high school student (Anna Paquin) who discovers that watching Alison Janney get hit by a bus will really throw you for a loop.  There's definitely going to be a tough balance here between hitting honest emotions of a teenager who witnesses and feels responsible for a tragedy and going too melodramatic.  Hopefully Lonergan and his excellent cast, which also includes Mark Ruffalo and Matt Damon, can keep the story grounded.

Hit the jump to check out the trailer and poster.  The film also stars J. Smith-Cameron, Jean Reno, Jeannie Berlin, and Matthew Broderick.  Margaret opens September 30th.

Click over to Apple to see the trailer in HD.

Here's the official synopsis for Margaret:

MARGARET centers on a 17-year-old New York City high-school student who feels certain that she inadvertently played a role in a traffic accident that has claimed a woman's life. In her attempts to set things right she meets with opposition at every step. Torn apart with frustration, she begins emotionally brutalizing her family, her friends, her teachers, and most of all, herself. She has been confronted quite unexpectedly with a basic truth: that her youthful ideals are on a collision course against the realities and compromises of the adult world.

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