Hi, Dirk!
I have some questions on project goals.
1. Are you going to create something portable or SBCL/something else only?
2. Are you going to rely on some communication library such as PVM/MPI or something completely independent?
3. Do you have some plan or just experimenting / imitating Erlang?
P.S. I am interested in parallel computation in Common Lisp. I have created UFFI bindings for PVM library. Though I do not remember exact URL of the project :)