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The referenced book is THE book. It was an easy read for someone who had no functional programming experience. :)

http://www.amazon.com/Programming-Erlang-Software-Concurrent...

I've been reading through the oreilly book, Erlang Programming. Its good (like all Oreilly titles) though I'm only into chapter 6. I'd definitely suggest picking it up.

Joe Armstrong's book is probably the best one to start with. It gives you a step-by-step learning process that will get you up and running with Erlang in short order. Once you are finished with it pick up Erlang Programming by Cesarini and Thompson; this book covers a lot of the same territory but goes a bit deeper into some areas that are missing from Armstrong's book (e.g. debugging & tracing, etc.)