Nalo Hopkinson. The Easthound. (The Best Science Fiction and Fantasy of the Year, Volume Seven.)
A cracker of a post-apocalypse story, with small groups of children hunkering down, fearing the moment when children become child-killers…
Nalo Hopkinson. Old Habits. (The Best Science Fiction and Fantasy of the Year Volume 6)
A touch of the Langoliers, in a ghost story with a difference that oozes quality throughout.