Aside from telecoms, where it's been running systems with over 99.99% uptime for decades now, Erlang is also used in production by 37signals and GitHub. Amazon

Aside from telecoms, where it's been running systems with over 99.99% uptime for decades now, Erlang is also used in production by 37signals and GitHub. Amazon SimpleDB contains Erlang components. Powerset, acquired by Microsoft to become one of the technologies behind Bing, built their load balancing application server (Fuzed) and distributed datastore (Dynomite) in Erlang. So it depends on what you mean by "taken off". Plenty of large and small companies have been using it successfully for years. In the last two years the number has started growing rapidly.