>     The only concern with that is the BSD license
>     on the code; is that going to be a problem?
>
> I don't see a license notice, but we could ask him to
> allow us to use it under the MIT license.

Indeed, if you know the author of some code/prose personally, please ask
them if they can dual-license any stuff where licensing is difficult to
figure out. MIT and BSD should be equivalent in practice so it's hard to
imagine that any Schemer would be strongly in favor of one but not the
other, especially given the opportunity to help Scheme and SRFI.
Copyleft vs permissive is a real debate, but both of these licenses are
permissive.

> He makes a good case for the SML model.

I'm not familiar with Concurrent ML, but everyone in the Scheme
community who knows it seems to love it. Loko implements it as well.