Given the progress Jay has made with EMaxima, the following may
be of little interest. Nevertheless:
I modified Maxima's continue function so that it outputs TeX and
wrote a batchlatex function that looks for Maxima commands that
are embedded in LaTeX. My lisp code and some documentation may
be downloaded from
http://www.unk.edu/acad/math/people/willisb/home.html
This page has some additional Maxima code.
Regards,
Barton