Mansions of Madness is one of my favourite board games for the last year or so. The players are a bunch of Occult Investigators trying to solve Lovecraftian mysteries. It's a fully cooperative game, with an app that takes care of all monster generation and so on.
I much prefer it to the first edition of the game, where you had a game master playing all the baddies.
My latest blog post about it.
The Shoggoth:
Investigators and deep ones
More pictures and words can be found on the blog!