Well, dragonclaw15's story "Laney's Angel" was one of the most interesting and immersive Space Marine stories I've read this year, and this from a person who usually can't stand Space Marine stories.
I also wanted to at least mention Ddep, even though I'm not nominating him (it was a tough call though) for his story "The Assassin" which made me laugh more than I thought a 40k story could!
Counted ~MTWC