these "Learn You..." (NB: this does not include LPTHW) books seem like a post-modern version of the "For Dummies" series. So, if you enjoyed the vapid "For Dummies"-style jokes but wanted more non-sequiturs, these are the books for you.
I can say, however, that there already exist a few books on Erlang, quite serious, that actually cost money. I wanted to offer a free resource to learn Erlang, given my frustration at the lack such things when I began learning the language myself. I found a problem, and am currently trying my best to solve it.
If you feel like learning the language but my book's style and/or tone annoys you, you might prefer buying one of the books. There's also an online tutorial on erlang.org and an interactive one on tryerlang.org.
A link, for anybody who's curious: