I wonder how is going the Lisp Favored Erlang project, http://lfe.io. As someone that enjoys lisp and prolog I find erlang a very nice language. Two feature I find handy: One is the ability to modify code while running, the other is OTP. Joe's thesis, available online, was for me an excellent resource to learn Erlang. I think that a good use case for Erlang is when a lot of actors are needed each one doing a little work with little resources (no big library, regular expression, atlas, or the like used).

Funny, I recall some surprise in the community because Joe was asking some easy question about C for some glue code. It's been 5 years since I touched Erlang, only for learning, but is message passing style and the way you create functions like in prolog (or in Shen or picolisp) is unique and a great virtue. I know that tcl has secure interpreters, I wonder if there is such a think in erlang.