Not sure if anyone's interested at all, but I forked this a little while ago and have been on-and-off hacking on it for the past couple of days

https://github.com/Inaimathi/Common-Lisp-Actors

Comments and criticisms appreciated.

I'm currently experimenting with adding output queues to each actor so that they can be completely decoupled rather than statefully tracking targets. That seems to be the only annoying part of developing with the library. It seems that the changes were made without major explosions, but it's pretty late my last tea was quite a while ago.