Book: Programming Erlang: Software for a Concurrent World
I actually read this book a few years ago -- I was searching for a better way for concurrent programming and found Erlang. Coincidently, Erlang was starting to get some attention little after. I believe this was the only Erlang book at that time. The book clearly shows and explains how to program in Erlang. Reading this book was like a wake-up call for me, whose background is mostly OOP and procedural languages.