Thank you all for these references.
I'm going to study the TeaTime implementation from the Open Croquet version "restored" for Squeak by Nikolay Suslov and we'll share our experiments.
Regarding BluePlane.xyz we are moving slowly. For the moment��we have been playing with ideas like Scenario-Based Programming (by David Harel). We implemented a very rough library for "behavioral programming" in Pharo with some typical examples. We are now refactoring it to use actors instead of processes. We hope to release it soon
Cheers,
Rafael Luque.