Slim is a new communication protocol for the Fitnesse acceptance testing framework (see http://fitnesse.org/ for details, as well as the following intro video).
This extremely lightweight library allows you to run Fitnesse tests of your Erlang programs, using the Slim protocol.
You can download the Erlang sources HERE on Google code.
Disclaimer: This is my first Erlang project, and I do not pretend to know either Fitnesse nor Erlang very well. All constructive feedback is extremely welcome.