The book is nice for sure, but I found it way too long. It's written for beginners and that's a good thing (for them) and a pity (in my case): I might have known next to nothing about Erlang, but I was already a seasoned programmer with experience with functional programming, so the whole chapter about recursion (or three about basic types...) was a bit too much for me[1].
I was learning Erlang primarily from it's documentation, beginning from syntax and then reading through library reference[2] and some examples here and there. I'm sure that this list would be quite helpful for me then and I find it useful even now.
[1] I returned to LYSE later when I knew better which parts I can safely skip and which to read. Also, I think the book was not completed back then.
[2] The worst web-based docs I ever read. Due to ability to see only one level of a tree at once I was missing massive chunks of functionality. Then I realized I have the same docs on disk as they came with Erlang (not on windows though). Basic find and grep were so much better than even google+erlang www docs! Really, just don't do it. Read the docs from your hard drive.