"The Remnant" by Cassie Beasley appeared in Daily Science Fiction on January 8, 2013. "An alien invasion of earth is thwarted, and a rustic human from a small town is enlisted to deal with an alien survivor."
Not since War of the Worlds do I recall an alien invasion story that went this badly for the aliens--so this story is refreshing and even somewhat original in that regard. The ending of the story is just not quite satisfying enough for me, but the moral dilemma in the story (should the survivor be killed or not) is something that will linger in my mind for a while. 6 out of 7 rocket-dragons.