One of the free podcasts that I regularly listen to, Pseudopod, provides narrations of horror short stories, plus excellent, insightful intros and outros. The site's discussion forum recently called for nominations for its Best of 2014 episodes. After submitting my thoughts to the forum, I'm sharing them here, too.
Pseudopod 400: The Screwfly Solution by James Tiptree Jr. read by Matt Franklin, Tina Connolly, Anna Schwind, Matt Weller, Rish Outfield, Eric Luke, George Hrab & Jarus Durnett
(sadly feels as though it were just as plausible and terrible now, if not more so, than it probably did when originally published)
***Pseudopod 399: The Wriggling Death by Harold Gross read by Veronica Giguere
(disgusting, disturbing, fascinating worldbuilding, and a twisted sisterly relationship -- highly memorable)
Pseudopod 418: Shadow Transit by Ferrett Steinmetz read by Marie Brennan
(that poor mom, struggling with her reluctance and guilt as her daughter seems happy training to fight eerie doom)
Pseudopod 393: West Gate by Mitchell Edgeworth read by Ron Jon
(intense snapshot of panic in flight from an unknown menace)
Pseudopod 394: Summer Girls by Caspian Gray read by Robert A.K. Gonyo
(mixture of uncanny yet taken-for-granted floater-ghost with real-life creepiness of an entitled-feeling guy)
As for best narrators, I'm afraid I rarely think to take note of the narrator when the reading is great but the story is only good, although that does uplift the experience and makes the story itself give a better impression. All of the above readers are great, but there are many other award-worthy readers, so I guess I won't nominate in this category.
I can't think of any stories this year that were less than good! Horror isn't my usual thing, and I only came to this podcast because of listening to the siblings, Escape Pod and Podcastle; however, Pseudopod selections are always interesting and often very evocative, and the characters and their reactions to impossible, horrific situations seem very real. I value the fresh perspectives I get from these "true" stories, even if they aren't comfortable listening!
*** The three asterisks in front of Pseudopod 399 indicate that the story was a podcast original. All others are podcast narrations of stories that were originally printed elsewhere (cited on the linked pages).
James Tiptree Jr. was a pseudonym adopted by a woman to help sell her stories (since women read both genders but men are more likely to read works by men). Much of her work explored gender issues; "The Screwfly Solution," which was published in 1977 and won the Nebula Award for best novelette, certainly did this. I don't want to spoil the plot, so I won't say more about that, other than to emphasize that all the conflicts over gender issues during the past year make it seem more horribly relevant than ever.
Bonus: It's in epistolary form, which is always neat when done well. (That's why so many narrators are listed.)