{\red
\section*{To Do}

\cite{Papadima:UFTI4Braids} also has an algebraic construction of
a multiplicative expansion for braids over $\bbZ$.

I should comment on the relationship with Vassiliev invariants on surfaces,
as e.g.\ in Gonza\'alez-Meneses-Paris and Bellingeri.

I should have a ``computability'' section.
}