From what I've heard and seen Erlang is great, but this article doesnt tell me anything about why it is great. Message passing? Come on! You can do message passing in C++, or Python, or any other mainstreem language. Its a matter of convention and system architecture. Its easier to hire developers for a mainstream language, and its probably easier to teach them these conventions then a whole new language + development environment. So, whats all the fuss about Erlang?

PS. I dont mean to be critical about Erlang, I just dont think the article addresses the question in its title.