I recently wrote a simple, event-driven, simulation framework to allow me to quickly prototype and test distributed protocols. Unfortunately it did not scale in the number of messages simulated. So I am planning to re-implement it.
To keep with the spirit of rapid prototyping, I want to use a dynamically typed language. My final two candidates are Erlang and Stackless Python (or rather PyPy). There certainly is a lot of buzz around Erlang these days: My advisor is very enthusiastic about it, and after reading through the tutorial and dummy protocols, I can see why. On the other hand, Stackless Python has the familiar syntax and the huge library of modules.
I read through many posts comparing the two and I finally decided to stick with Python for now. I will code up the framework (hopefully this week) and report back on my findings. However, I am personally still interested in coding something in Erlang, so who knows