Rob,

> Hi Jecel,  What is MIT ConcurrentSmalltalk and do you have any
> info/links?

It was the language of the J-Machine:

   http://cva.stanford.edu/j-machine/cva_j_machine.html

There are many great ideas in there and it does have Smalltalk 
semantics, but the syntax is pure Lisp.

> Is it related to the book on the same subject? 

No, which is why I put "MIT" to avoid confusion. They are two separate 
projects with the same (obvious) name.

> I was
> considering those extensions, along with the async work I had already
> done.  This is where I got the idea for a secretary.

Yes, there are great ideas in this project as well.

  http://www.acm.org/pubs/citations/proceedings/oops/28697/p331-yokote/
  http://www.acm.org/pubs/citations/proceedings/oops/38765/p406-yokote/

-- Jecel