Some days ago, during a learning night, I met Elixir, a modern functional language based on Erlang. I was surprised how fast I was able to write some code.
First I watched "Meet Elixir" from PeepCode and after these 120 minutes I was able even to refactor code found on some Gists.
Don't get me wrong, I still love Ruby but Elixir could be the perfect choice for some kind of applications, it's enabled "as-is" for concurrency and I'm intrigued by hot code upgrades (I know it's a characteristic of Erlang), its sintax is clear and the fact that most of its code is written in Elixir is a pro to get your hands dirty.
To continue learning Elixir I decided to buy "Programmin Elixir" from Pragmatic Bookshelf, I already bought many of their books and I usually found them very well done and useful