Working with a sympathetic, clear eye, writer/director David Gordon Green (All the Real Girls, 2003) may be the best portraitist of small-town America working in cinema today. In Snow Angels, the unnamed burg where three couples interlock functions as an actual character in the film: a wintry, rueful shadow that, more idiosyncratic than shopping-mall banal, sets the tenor for this study of the paradoxes inherent in emotional intimacy. Kate Beckinsale and Sam Rockwell mine new depths as a couple who married too young, and Amy Sedaris, in a rare dramatic turn, tears up all her scenes as a fiercely open-hearted waitress with undeserving friends.