And a little side note (I'll officially announce it later), the official Actor Basic is now hosted at:
It is just one package out of a collection of packages aimed at writing roguelike (more like rogue-lite as I am interested in the real-time nature of such environments) games.
The splicing case syntax @countvajhula mentioned in the notes is:
It's very rudimentary, but shows the purpose and simple implementation of splicing syntax in dispatching expressions.