Trakt for iOS
Works on iPhone and iPad.
Just watched the first three episodes, but so far I'm loving this series. It brings an emotional side to the zombie apocalypse genre in a very lovely and impactful way. Episode three is one of the best episodes of television ever, pretty much up there with Castle Rock's Season 1 episode 7 "The Queen". Very powerful mini story with wonderful acting.
EDIT AFTER THE END OF THE SEASON:
I'm staying by my initial reaction - this show is really worth watching. It's visceral, emotional and most of all - human. Highly recommend.