Credit sequences are becoming more of a norm in feature films, whether it be just a stylistic exploration that is done in the Harry Potter series, or a graphic short that acts as a summary for what was just watched; think Lemony Snickets.
This great credit sequence, executed wonderfully by Hush Studios, acts as the latter, symbolically summing up each of the characters portrayed in the film with some great design and animation.
On a side note, I wonder if credit sequences will go down the road of importance that the title sequences have. As of right now, title sequences act as prologue to the film, setting the mood and story for the audience before the movie really begins. On the flop side, a credit sequence could potentially act as an epilogue and be used as a means to further tell the story, maybe even set up scenarios for a next film..who knows.